function preload(imgObj,imgSrc) {
        if (document.images) {
                eval(imgObj+' = new Image()')
                eval(imgObj+'.src = "'+imgSrc+'"')
        }
}



 function do_windowopen(url) {
 window.open(url,'','width=600, height=400'); 
 } 
 	

function changeImage(layer,imgName,imgObj) {
        if (document.layers && layer!=null) eval('document.'+layer+'.document.images["'+imgName+'"].src = '+imgObj+'.src');
        else document.images[imgName].src = eval(imgObj+".src");
}



function changeOpac(opacity, imgName) {
	var object = images.[imgName].style; 
	object.opacity = (opacity / 100);
	object.MozOpacity = (opacity / 100);
	object.KhtmlOpacity = (opacity / 100);
	object.filter = "alpha(opacity=" + opacity + ")";
}


function shiftOpacity(imgName, millisec) { 
    //if an element is invisible, make it visible, else make it ivisible 
    if(document.images[imgName].style.opacity == 0) { 
        opacity(id, 0, 100, millisec); 
    } else { 
        opacity(id, 100, 0, millisec); 
    } 
}

function blendimage(divid, imgName, imgObj, millisec) {
	var speed = Math.round(millisec / 100);
	var timer = 0;
	
	//set the current image as background
	document.getElementById(divid).style.backgroundImage = "url(" + document.images[imgName].src + ")";
	
	//make image transparent
	changeOpac(0, imgName);
	
	//make new image
	//document.getElementById(imageid).src = imagefile;
if (document.layers && layer!=null) eval('document.'+layer+'.document.images["'+imgName+'"].src = '+imgObj+'.src');
        else document.images[imgName].src = eval(imgObj+".src");

	//fade in image
	for(i = 0; i <= 100; i++) {
		setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
		timer++;
	}
}

function currentOpac(id, opacEnd, millisec) {
	//standard opacity is 100
	var currentOpac = 100;
	
	//if the element has an opacity set, get it
	if(document.getElementById(id).style.opacity < 100) {
		currentOpac = document.getElementById(id).style.opacity * 100;
	}

	//call for the function that changes the opacity
	opacity(id, currentOpac, opacEnd, millisec)
}

function opacity(id, opacStart, opacEnd, millisec) {
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;

	//determine the direction for the blending, if start and end are the same nothing happens
	if(opacStart > opacEnd) {
		for(i = opacStart; i >= opacEnd; i--) {
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	} else if(opacStart < opacEnd) {
		for(i = opacStart; i <= opacEnd; i++)
			{
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	}
}