function popWindow(HTMLfile,windowName,windowWidth,windowHeight)
{
	xoffset=0;
	yoffset=0;
	if (screen.width)
	{
		xoffset=(screen.width-windowWidth)/2;
		yoffset=(screen.height-windowHeight)/2;
	}
	params="width="+windowWidth+",height="+windowHeight+",location=0,menubar=0,resizable=0,scrollbars=0,status=0,titlebar=0,toolbar=0,hotkeys=0,screenx="+xoffset+",screeny="+yoffset+",left="+xoffset+",top="+yoffset;
	window.open(HTMLfile,windowName,params);
}