function openWindow(url, target, windowWidth, windowheight, scroll) {

	if(screen){
		leftPos = screen.width / 2 - (windowWidth / 2)
		topPos = screen.height / 2 - (windowheight / 2)
	}

	var new_win = window.open(url, target, "width="+windowWidth+",height="+windowheight+",resizable=no,top="+topPos+", left="+leftPos+",scrollbars="+scroll+",menubar=no,toolbar=no,directories=no,location=no,status=no");
	if(window.focus)new_win.focus();
}


		
		function isNum(quick_search) {
		
				var valueSearch = quick_search.listingID.value;
		
		
		
		
		
					if(valueSearch == "") {
		
						alert("No value");
						return false
		
						}
		
					for(i=0; i<valueSearch.length; i++) {
		
						if(valueSearch.charAt(i) < "0") {
							alert("Please enter a digit");
							quick_search.listingID.focus()
							quick_search.listingID.select()
							return false
						}
		
						if(valueSearch.charAt(i) > "9") {
							alert("Please enter a digit");
							quick_search.listingID.focus()
							quick_search.listingID.select()
							return false
						}
					}
		
				return true
		
				}