function forum(url)
{
w=769; h=552;
ScrWidth = screen.width;
ScrHeight = screen.height;
posx=ScrWidth/2-w/2;
posy=ScrHeight/2-h/2;
newWindow=open(url,"win1","left="+posx+", top="+posy+", width="+w+"px, height="+h+"px"); newWindow.focus();
}