var file;
var w;
var h;
function openWin(file,w,h) {

var x = screen.availWidth;
var y = screen.availHeight;
w = open(file, "find","width="+w+",height="+h+",status=no,toolbar=no,scrollbars=no,menubar=no,left="+(x-w)/2+",top="+(y-h)/4);
}