function checkHelp(searchString) {

    if(searchString.length<3) {
        alert("Bitte gib mindestens drei Zeichen ein.");
        return false;
    } else {
        return true;
    }
}

// ------------------------------------------------------------------

function setRandom(){
   return Math.round(Math.random()*(122-48))+48;
}

// ------------------------------------------------------------------

function randomString(z){

  var chars = new Array();
  var x=0;
  var y=0;

  while(chars.length!=z){
      var num =  setRandom();
      if((num>47 && num<58) || (num>65 && num<91) || (num>96 && num<123)){
          if((num>47 && num<58)&&(x<2)){
              chars.push(String.fromCharCode(num));
              x++;
          }else if(y<z-2){
              chars.push(String.fromCharCode(num));
              y++;
          }
      }
  }

  return chars.join('');
}

// ------------------------------------------------------------------

function popUp(url, width, height, options) {

    if(options=="") options = "location=no,menubar=0,scrollbars=no,status=no,toolbar=no";

    win = window.open(url, randomString(6), 'height=' + height + ',width=' + width + ',' + options);
	win.focus();
	return false;
}

// ------------------------------------------------------------------