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 blenddiv(divid,imageid,imagefile0,description,height,adiv){
	hide_contact();
	
	var getMargin_0= (viewHeight - height) / 2;
	var getMargin = getMargin_0 - 15;
	
	
	newHTML2 = '<div id="' + divid + '">';
	newHTML2 = newHTML2 + '<div align="center" style="margin-top:'+ getMargin +'px;"><img id="'+imageid+'" alt="" src="' + imagefile0 + '"></div>';
	newHTML2 = newHTML2 + '<div class="image_view_txt">' + description + '</div>';
	newHTML2 = newHTML2 + '</div>';
	
	document.getElementById("viewer").innerHTML = newHTML2;
	
	if (adiv != '')
	{
	hide_num(adiv);
	}
}

var stats=null;
var d_seq = 0;
var old_div=null;
var old_div=null;


function clear_blenddiv(old_div,old_imageid){
	document.getElementById(old_div).style.display="none";
	document.getElementById(old_imageid).style.display="none";
	//document.getElementById(old_imageid).style.zIndex="-1";

	stats=null;
}

function blend(divid,imageid,imagefile0,imagefile1,imagefile2,imagefile3,img_no,description,millisec,height,adiv) {

	if (stats != null) {
		clear_blenddiv(old_div,old_imageid);
	}
	
	divid = divid + d_seq ;
	imageid = imageid + d_seq ;
	
	blenddiv(divid,imageid,imagefile0,description,height,adiv);

	old_div = divid;
	old_imageid = imageid;

	blenddiv(divid,imageid,imagefile0,description,height,adiv);

	var timer2 = 0;
	var images = new Array(imagefile0, imagefile1, imagefile2, imagefile3);
	
	for (x = 0; x < img_no; x++) {
		imagefilex=images[x];
		var fade = setTimeout("blendimage('"+divid+"','"+imageid+"','"+imagefilex+"','"+millisec+"')",(timer2 * 4000));
		timer2++;
	}
	stats=1;
	d_seq++;
}

function blendimage(divid, imageid, imagefilex, 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(imageid).src;

		//make image transparent
		changeOpac(0, imageid);
		
		//make new image
		document.getElementById(imageid).src = imagefilex;

		//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)
}