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

	//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 getPageScroll(){
 
 var yScroll;
 
 if (self.pageYOffset) {
  yScroll = self.pageYOffset;
 } else if (document.documentElement && document.documentElement.scrollTop){  // Explorer 6 Strict
  yScroll = document.documentElement.scrollTop;
 } else if (document.body) {// all other Explorers
  yScroll = document.body.scrollTop;
 }
 
 arrayPageScroll = new Array('',yScroll) 
 return arrayPageScroll;
}
 
 
 
//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
//
function getPageSize(){
 
 var xScroll, yScroll;
 
 if (window.innerHeight && window.scrollMaxY) { 
  xScroll = document.body.scrollWidth;
  yScroll = window.innerHeight + window.scrollMaxY;
 } else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
  xScroll = document.body.scrollWidth;
  yScroll = document.body.scrollHeight;
 } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
  xScroll = document.body.offsetWidth;
  yScroll = document.body.offsetHeight;
 }
 
 var windowWidth, windowHeight;
 if (self.innerHeight) { // all except Explorer
  windowWidth = self.innerWidth;
  windowHeight = self.innerHeight;
 } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
  windowWidth = document.documentElement.clientWidth;
  windowHeight = document.documentElement.clientHeight;
 } else if (document.body) { // other Explorers
  windowWidth = document.body.clientWidth;
  windowHeight = document.body.clientHeight;
 } 
 
 // for small pages with total height less then height of the viewport
 if(yScroll < windowHeight){
  pageHeight = windowHeight;
 } else { 
  pageHeight = yScroll;
 }
 
 // for small pages with total width less then width of the viewport
 if(xScroll < windowWidth){ 
  pageWidth = windowWidth;
 } else {
  pageWidth = xScroll;
 }
 

 arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
 return arrayPageSize;
}
 

// Function to open and close Divs

function openPopDiv(divId)
     {
       var arrayPageSize = getPageSize();
       var arrayPageScroll = getPageScroll();
       var fadeDiv=document.getElementById('fade');
       fadeDiv.style.height=(arrayPageSize[1] + 'px');
	   fadeDiv.style.display="block";
       document.getElementById(divId).style.display="block";
       opacity(divId,0,100,300);
	   
	
     }
     
function closePopDiv(divId)
     {
     	document.getElementById('fade').style.display="none";
     	document.getElementById(divId).style.display="none";
     	opacity(divId,100,0,300);
		
		

     }