function popup(url){
	
	var t = screen.Height /4
	var l = screen.Width  /4
	
	var h = screen.Height /2
	var w = screen.Width /2


	var settings = "height="+h+",width="+w+",top="+t+",left="+l+",menubar=yes,scrollbar=yes,resizable=yes"
	var win = window.open(url,"win",settings)

}