function showhide(what) {
		pre = eval(what + ".style");
      if (pre.display=='none') {
        pre.display='';
      }
      else {
        pre.display='none'
      }
}

//popup openen
function openPopup(url,w,h) {
	var winl = (screen.width-w)/2;
  	var wint = (screen.height-h)/2;
    var parString = "width=" + w + ",height=" + h
       + ",toolbar=0,location=0,directories=0"
       + ",status=0,menuBar=0,scrollBars=0,resizable=0"
	   + ",top="+wint+",left="+winl;
    var winPop = window.open(url,"",parString);
	if(parseInt(navigator.appVersion) >= 4){winPop.window.focus();}
}