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++;
		}
	}
}

//change the opacity for different browsers
function changeOpac(opacity, id) {
	var object = document.getElementById(id).style; 
	object.opacity = (opacity / 100);
	object.MozOpacity = (opacity / 100);
	object.KhtmlOpacity = (opacity / 100);
	object.filter = "alpha(opacity=" + opacity + ")";
}



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



function blendimage(divid, divid1, divid2, divid3, imageid, imageid1, imageid2, imageid3, imagefile, imagefile1, imagefile2, imagefile3, millisec)
{var speed = Math.round(millisec / 100);
var timer = 0;

//set the current image as background

document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";

document.getElementById(divid1).style.backgroundImage = "url(" + document.getElementById(imageid1).src + ")";
document.getElementById(divid2).style.backgroundImage = "url(" + document.getElementById(imageid2).src + ")";
document.getElementById(divid3).style.backgroundImage = "url(" + document.getElementById(imageid3).src + ")";
//make image transparent

changeOpac(0, imageid);
 changeOpac(0, imageid1);
 changeOpac(0, imageid2);
 changeOpac(0, imageid3);

//make new image

document.getElementById(imageid).src = imagefile;


document.getElementById(imageid1).src = imagefile1;
document.getElementById(imageid2).src = imagefile2;
document.getElementById(imageid3).src = imagefile3;
//fade in image

for(i = 0; i <= 99; i++) {

setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));

setTimeout("changeOpac(" + i + ",'" + imageid1 + "')",(timer * speed));

setTimeout("changeOpac(" + i + ",'" + imageid2 + "')",(timer * speed));

setTimeout("changeOpac(" + i + ",'" + imageid3 + "')",(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 changeOpac(opacity, id) { 
    var object = document.getElementById(id).style; 
    object.opacity = (opacity / 100); 
    object.MozOpacity = (opacity / 100); 
    object.KhtmlOpacity = (opacity / 100); 
    object.filter = "alpha(opacity=" + opacity + ")"; 
}