function cleartext(id)
{
    document.getElementById(id).value= "";
}

// open a popup window
function openwin(url,w,h,s) 
{
    var scrl;
	if (s) 
	{ 
	    scrl="scrollbars=yes,"; w = w+16; 
	}
	else 
	{ 
	    scrl="scrollbars=no,"; 
	}

	if (!w) w = 640;
	if (!h) h = 480;

	fenster = window.open(url,"_blank",scrl+"resizable=yes,width="+w+",height="+h+",screenX=50,screenY=50");
	fenster.focus();
}