// Set event handler to initialize API
var isCSS, isW3C, isIE4, isIE6CSS, isNN4, isNN6; 
var heightCT, widthWindow, widthContent;

window.onresize = checkIBrowser;

// let all IBrowsers establish content objects
function checkIBrowser() {
		if (document.images) {
        isCSS = (document.body && document.body.style) ? true : false;
        isW3C = (isCSS && document.getElementById) ? true : false;
        isIE4 = (isCSS && document.all) ? true : false;
        isIE6CSS = (document.compatMode && document.compatMode.indexOf("CSS1") >= 0) ? true : false;
        isIE7 = (window.XMLHttpRequest && window.ActiveXObject) ? true : false;
        isNN4 = (document.layers) ? true : false;
        isNN6 = (document.getElementById && !document.all) ? true : false;
        isOPE = (window.opera) ? true : false;
                
        if (isW3C) {

					// Ricavo le largezze della finestra del browser e del contenuto 
					// della pagina, e l'altezza della finestra del browser
        	widthWindow = getInsideWindowWidth();        	
        	widthContent = getObjectWidth("divcontent");
        	heightWindow = getInsideWindowHeight();        	
        	
        	// Fisso la posizione del contenuto pagina
        	//getObject("divcontent").position = "absolute";	
										
				  // Calcolo la centratura
				  if (widthWindow > widthContent) {
				  	leftMargin = ((widthWindow - widthContent) / 2);
				  	getObject("divcontent").left = leftMargin + 'px';
				  }
				  else {
				  	getObject("divcontent").left = '0px';
				  }
				  
				  if (getRawObject("divpaginasx")) {
				  	//Imposto l'altezza del div del menu secondario;
				  	if (getRawObject("divpaginasx") && heightWindow <= 550) {
				  		getObject("divpaginasx").height = '550px'; 
				  	}
				  	else {
					  	getObject("divpaginasx").height = (isIE4) ? (heightWindow - 3 + 'px') : (heightWindow - 3 + 'px');				  	
					  }
					 }

			    if ( getRawObject("divextra") && getRawObject("divextra2") ) {
				    // set the right divextra position
				    if (getRawObject("divextra") && getRawObject("divextra2") && widthWindow > 950) {
				    	difY = (heightWindow < getObjectHeight("divcontainer") && isNN6) ? 8 : 0 ;
		    		  visibleWidth = ( ( (widthWindow - 950) / 2 ) - 12) & 65535;
		    		  posx = visibleWidth + 950 - difY;
		    		  shiftTo("divextra", posx, 0);
		    		  shiftTo("divextra2", posx, 0);
		    		  getObject("divextra").width = (visibleWidth < 950) ? visibleWidth - difY + 22 + "px" : "0px";
		    		  getObject("divextra2").width = (visibleWidth < 950) ? visibleWidth - difY + 22 + "px" : "0px";
		    		  
		    		  if (isOPE) {
		    		  	getObject("divextra").top = 3 + 'px';
		    		  	getObject("divextra2").top = 358 + 'px';
		    		  }
		    		  else {
		    		  	if (isIE7) {
		    		  		getObject("divextra").top = 3 + 'px';
		    		  		getObject("divextra2").top = 358 + 'px';
		    		  	}
		    		  	else if (isIE4) {
		    		  		getObject("divextra").top = 9 + 'px';
		    		  		getObject("divextra2").top = 364 + 'px';				    		  		
		    		  	}
		    		  	else {
		    		  		getObject("divextra").top = 3 + 'px';
		    		  		getObject("divextra2").top = 358 + 'px';
		    		  	}		    		
		    		  }
		    		  //getObject("divextra").top = (isIE4) ? (124 + 'px') : (120 + 'px');	    		   			    		  
		    		  //getObject("divextra2").top = (isIE4) ? (484 + 'px') : ( (isOPE) ? (20000 + 'px') : (478 + 'px') );
		    		}
		    		else {
		    			getObject("divextra").width = '0px';
		    		  getObject("divextra").top = '-1000px';
		    		  getObject("divextra2").width = '0px';
		    		  getObject("divextra2").top = '-1000px';
		    		}
		    	}        
        }        
        return true;
    }
    else return false;
}

// Set the background color of an object
function setBGColor(obj, color) {
    var theObj = getObject(obj);
    if (theObj) {
        if (isNN4) {
            theObj.bgColor = color;
        }
        else if (isCSS) {
            theObj.backgroundColor = color;
        }
    }
}

// Convert object name string or object reference
// into a valid style (or NN4 layer) reference
function getObject(obj) {
    var theObj = getRawObject(obj);
    if (theObj && isCSS) {
        theObj = theObj.style;
    }
    return theObj;
}

// Convert object name string or object reference
// into a valid element object reference
function getRawObject(obj) {
    var theObj;
    if (typeof obj == "string") {
        if (isW3C) {
            theObj = document.getElementById(obj);
        }
        else if (isIE4) {
            theObj = document.all(obj);
        }
        else if (isNN4) {
            theObj = seekLayer(document, obj);
        }
    } else { // pass through object reference
        theObj = obj;
    }
    return theObj;
}

// Set the visibility of an object to visible - true or hidden - false
function showHideObject(obj, sw) {
    var theObj = getObject(obj);
    if (theObj) {
    	if (sw)
        	theObj.visibility = "visible";
        else
        	theObj.visibility = "hidden";
    }
}

// change cursor style
function cursorStyle(obj) {
	if (isCSS) {
		if (isNN4 || isNN6)
			obj.style.cursor='pointer';
		else
			obj.style.cursor='hand';
	}
	return;
}

// change all select color list for IE
function chngSelectColor() {
    var arg = chngSelectColor.arguments;
    for (i = 0; i < arg.length; i++) {
        obj = getRawObject(arg[i]);
        if (obj) {
			for (j = 0; j < obj.options.length; j++) {
			    if (obj.options[j].selected == false) {
				    chngInputColor(obj.options[j], true, true);
			    }
			}
        }
    }
}

// change Input Color
function chngInputColor(what, sw, init, colorSelected, colorNotSelected) {
	if (sw) { // on focus
		setBGColor(what, colorSelected);
		if (!init) {
			objElement = getRawObject(what.name);
			if (objElement.options)
				for (i = 0; i < objElement.options.length; i++)
					setBGColor(objElement.options[i], colorSelected);
		}
	}
	else { // on blur
		setBGColor(what, colorNotSelected);
		objElement = getRawObject(what.name);
		if (objElement.options)
			setBGColor(objElement.options[objElement.selectedIndex], colorNotSelected);
	}

}

// Position an object at a specific pixel coordinate
function shiftTo(obj, x, y) {
    var theObj = getObject(obj);
    if (theObj) {
        if (isCSS) { // equalize incorrect numeric value type
            var units = (typeof theObj.left == "string") ? "px" : 0 
            theObj.left = x + units;
            theObj.top = y + units;
        }
        else if (isNN4) {
            theObj.moveTo(x,y)
        }
    }
}

// Move an object by x and/or y pixels
function shiftBy(obj, deltaX, deltaY) {
    var theObj = getObject(obj);
    if (theObj) {
        if (isCSS) { // equalize incorrect numeric value type
            var units = (typeof theObj.left == "string") ? "px" : 0 
            theObj.left = getObjectLeft(obj) + deltaX + units;
            theObj.top = getObjectTop(obj) + deltaY + units;
        }
        else if (isNN4) {
            theObj.moveBy(deltaX, deltaY);
        }
    }
}

// Set the z-order of an object
function setZIndex(obj, zOrder) {
    var theObj = getObject(obj);
    if (theObj) {
        theObj.zIndex = zOrder;
    }
}

// Retrieve the x coordinate of a positionable object
function getObjectLeft(obj)  {
    var elem = getRawObject(obj);
    var result = 0;
    if (document.defaultView) {
        var style = document.defaultView;
        var cssDecl = style.getComputedStyle(elem, "");
        result = cssDecl.getPropertyValue("left");
    }
    else if (elem.currentStyle) {
        result = elem.currentStyle.left;
    }
    else if (elem.style) {
        result = elem.style.left;
    }
    else if (isNN4) {
        result = elem.left;
    }
    return parseInt(result);
}

// Retrieve the y coordinate of a positionable object
function getObjectTop(obj)  {
    var elem = getRawObject(obj);
    var result = 0;
    if (document.defaultView) {
        var style = document.defaultView;
        var cssDecl = style.getComputedStyle(elem, "");
        result = cssDecl.getPropertyValue("top");
    }
    else if (elem.currentStyle) {
        result = elem.currentStyle.top;
    }
    else if (elem.style) {
        result = elem.style.top;
    }
    else if (isNN4) {
        result = elem.top;
    }
    return parseInt(result);
}

// Retrieve the rendered width of an element
function getObjectWidth(obj)  {
    var elem = getRawObject(obj);
    var result = 0;
    if (elem.offsetWidth) {
        result = elem.offsetWidth;
    }
    else if (elem.clip && elem.clip.width) {
        result = elem.clip.width;
    }
    else if (elem.style && elem.style.pixelWidth) {
        result = elem.style.pixelWidth;
    }
    return parseInt(result);
}

// Retrieve the rendered height of an element
function getObjectHeight(obj) {
    var elem = getRawObject(obj);
    var result = 0;
    if (elem.offsetHeight) {
        result = elem.offsetHeight;
    }
    else if (elem.clip && elem.clip.height) {
        result = elem.clip.height;
    }
    else if (elem.style && elem.style.pixelHeight) {
        result = elem.style.pixelHeight;
    }
    return parseInt(result);
}

// Return the available content width space in browser window
function getInsideWindowWidth() {
    if (window.innerWidth) {
        return window.innerWidth;
    }
    else if (isIE6CSS) { // measure the html element's clientWidth
        return document.body.parentElement.clientWidth
    }
    else if (document.body && document.body.clientWidth) {
        return document.body.clientWidth;
    }
    return 0;
}

// Return the available content height space in browser window
function getInsideWindowHeight() {
    if (window.innerHeight) {
        return window.innerHeight;
    }
    else if (isIE6CSS) { // measure the html element's clientHeight
        return document.body.parentElement.clientHeight
    }
    else if (document.body && document.body.clientHeight) {
        return document.body.clientHeight;
    }
    return 0;
}


function openSubMenu(subMenu) {
    for(i = 0; i < 4; i++) {
        var obj = document.getElementById('sub_'+subMenu+'_'+i);
        if(obj != null) {
            if(obj.style.display == 'none' || obj.style.display == '') {
                obj.style.display = 'block';
            }
            else {
                obj.style.display = 'none';
            }
        }
    }
}