function show_image(id,xx,yy)
	{
	if (document.all) 
	    {
		 document.all[id].style.visibility="visible";
	     document.all[id].style.top= yy + 'px';
	     document.all[id].style.left= xx + 'px';
	    }
	 else if (document[id])
	    {document[id].visibility="visible";
	     document[id].top= yy + 'px';
	     document[id].left= xx + 'px';
	    }
	 else
	    {
	     document.getElementById(id).style.visibility="visible";
	     document.getElementById(id).style.top= yy + 'px';
	     document.getElementById(id).style.left= xx + 'px';
	    }
	}

function hide_image(id)
	{if (document.all) 
	    {
	     if (document.all[id])
	    	document.all[id].style.visibility="hidden";
	    	}
	 else if (document[id])
	    document[id].visibility="hidden";
	 else if (document.getElementById(id))
	    document.getElementById(id).style.visibility="hidden";
	}

function show_window(urltext,w,h) {
	if (!w) w=500;
	if (!h) h=500;
	var win=window.open(urltext,"","width="+w+",height="+h+",status=yes,resizable=yes,scrollbars=yes");
	win.focus();
    }