function detect() {
if (navigator.appName == 'Microsoft Internet Explorer' && navigator.platform == 'MacPPC') {
return true;
} else {
return false;
}
}
function openNewWindow(URLtoOpen, popwidth, popheight) {
var Macit = detect();
var screenWidth = screen.availWidth;
var screenHeight = screen.availHeight;
var x = (screenWidth/2)-(popwidth/2);
var y = (screenHeight/2)-(popheight/2);
if (Macit == 1) {
popwidth2 = popwidth - 16;
popheight2 = popheight - 16;
} else {
popwidth2 = popwidth;
popheight2 = popheight;
}
var winParams = "height=" + popheight2 + ",width=" + popwidth2 +",resizable=0,directories=0,dependent=1,toolbar=0,scrollbar=0,tollbar=0,screenX=" + x + ",screenY=" + y + ",left=" + x + ",top=" + y;
newWindow = window.open(URLtoOpen,'_blank', winParams);

}