function openWinInCenter(url,win_name,w,h)
{
   v = "width="+w+",height="+h+",left="+(screen.width-w)/2+",top="+((screen.height-h)/2-30)+",scrollbars=1";
   open(url,win_name,v);
}

function openwin(fileName,window_width,window_height)
{ 
  		var window_top = (screen.height-window_height)/2;
   		var window_left = (screen.width-window_width)/2;
   		newWindow=window.open(fileName,"","height="+window_height+",width="+window_width+",left="+window_left
        +",top="+window_top+",resizable=yes,scrollbars=yes,status=no,toolbar=no,menubar=no,location=no");	
}