function markSelection(txtObj)
	{
		if(txtObj.createTextRange) {
			txtObj.caretPos = document.selection.createRange().duplicate();
			isSelected = true;
		}
	}


	  var lastselect = "";

	function usersearch()
	{
	  var usersuche;
	  usersuche = "";
	  var usersuche = "(" + document.message_form.message.value + ")";
	  var Ausdruck = new RegExp(usersuche,"i");

	if(usersuche=="()" && lastselect!="")
	{
	      document.message_form.message.value = lastselect;
	      document.message_form.message.focus();
	}
	else
	{

	  var Satz = document.frmuseronlinetest.useronlinetest.value;
	  var usergruppe = Satz.split(",");

	  var txtpruefer;

	  for (var i=0;i<usergruppe.length;i++)
	  {

	    // if(usergruppe[i].match(usersuche)!== null)
	    Ausdruck.exec(usergruppe[i]);

	    if(usergruppe[i].match(Ausdruck)!== null)
	    {
	      lastselect = usergruppe[i] + ": ";
	      document.message_form.message.value = usergruppe[i] + ": ";
	      document.message_form.message.focus();
	      break;
	    }

	  }
	}

	document.message_form.message.focus();

	}

	function Taste (Ereignis) 
	{ 
	  if (!Ereignis) 
	  Ereignis = window.event; 

	  if (Ereignis.which) 
	  { 
	    Tastencode = Ereignis.which; 
	  } 
	  else if (Ereignis.keyCode) 
	  { 
	    Tastencode = Ereignis.keyCode; 
	  } 

	  if(Tastencode == 17)
	  { 
	    // alert("Tastencode: " + Tastencode);
	    usersearch();
	    document.message_form.message.focus();
	  } 

	} 

document.onkeydown = Taste;