var bgWnd = "";
var myWnd = "";

function openWin(target) {

    browser=(navigator.appName.indexOf("Microsoft")==-1)?"ns":"ie";
    system= (navigator.appVersion.indexOf("Mac")==-1)?"pc":"mac";
    
    tb = screen.availWidth;
    fb = 400;
	th = screen.availHeight;
	fh = 550;
	vl = (tb-fb)/2;
	vo = (th-fh)/2;

    bgProps = "width="+fb+",height="+fh+",top="+vo+",left="+vl+",dependent=no,resizable=no,scrollbars=yes";

        bgWnd = window.open(target,"bg",bgProps);
  }