function PopUp(strURL) {
var winl = (screen.width - 500) / 4;
var wint = (screen.height - 400) / 4;
winprops = 'height=400,width=500,top='+wint+',left='+winl+',scrollbars=yes'
win = window.open(strURL, "NewWin", winprops)
if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}