function pop(url,name, w_width, w_height, w_scr, w_tool)
    {
    var param="WIDTH="+w_width+",HEIGHT="+w_height+",toolbar="+w_tool+",location=no,scrollbars="+w_scr+",resizable=yes";
    extern = window.open(url,name,param);
	extern.focus(); 
	}