function show(url, w, h)
{ 
	var url = '/img/show.php';
	var name = 'win';
	var w = 600;
	var h = 300;
	var l = window.screen.availWidth/2 - w/2;
	var t = window.screen.availHeight/2 - h/2;
	window.open( url, name, "top="+t+"px,left="+l+"px,width="+w+"px,height="+h+"px,resizeable=yes,toolbar=no,location=no,status=no,menubar=no,scrollbars=no");
}