// JavaScript Document

	//
	// getPageScroll()
	// Returns array with x,y page scroll values.
	// Core code from - quirksmode.org
	//
	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;
	}
	
	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 popupClose() {		
		var thepopup = document.getElementById("imagePopup");
		thepopup.style.visibility = 'hidden';
		var theiframe = document.getElementById("popupIFrame");
		theiframe.style.visibility = 'hidden';
	}
	function popupOpen(newImage, newWidth, newHeight) {
		popupClose();		
		var theimage = document.getElementById("bigImage");
		theimage.src = newImage;
		theimage.width = newWidth;
		theimage.height = newHeight;
		var thepopup = document.getElementById("imagePopup");
		var thePage = getPageSize();
		var theScroll = getPageScroll();
		thepopup.style.left = (thePage[2] - newWidth) / 2 + 'px';
		thepopup.style.top = (theScroll[1] + ((thePage[3] - newHeight) / 2)) + 'px';
		thepopup.style.visibility = 'visible';
		var theiframe = document.getElementById("popupIFrame");
		theiframe.style.left = 0 + (thePage[2] - newWidth) / 2 + 'px';
		theiframe.style.top = (theScroll[1] + 0 + ((thePage[3] - newHeight) / 2)) + 'px';
		theiframe.width = newWidth + 5;
		theiframe.height = newHeight + 5;
		theiframe.style.visibility = 'visible';
	}