<!--
//-- QUERYSTRING RETRIEVER --//
	// gets variable value from querystring
	// call using variable name
	// returns variable value

	function isContainedInString(string,allowed) {
	    for (var i=0; i< string.length; i++) {
	       if (allowed.indexOf(string.charAt(i)) == -1)
	          return false;
	    }
	    return true;
	}
	
	function getValue(varName) {
		var url = window.location.href ;
		var urlParts = url.split("?") ;
		
		if (urlParts.length == 0 || urlParts[1] == undefined) {
			return "" ;
		}
			
		var qs = urlParts[1] ;
		var varPairs = qs.split("&") ;
		var value = "" ;
		
		if (varPairs.length == 0) {
			return "" ;
		}
	
		for (i=0; i<varPairs.length; i++) {
			var parts = varPairs[i].split("=") ;
			if (parts[0] == varName) {
				value = parts[1] ;
				break ;
			}
		}
		
		return value ;
	}



	function openPopup(imgSrc){
		emptyVar = window.open("viewer.htm?imgSrc=" + imgSrc,"popupWindow","width=720,height=596,scrollbars=0,screenX=350,left=350,screenY=40,top=40") ;
	}