// globals
var curSelVal = "";
var startPos = 0;
var endPos = 0;
// functions
function storeCurVal(obj, start, end) 
{
	// function not called if IE 4+
	curSelVal = document.update_form.tekst.value;
  	startPos = obj.selectionStart;
	endPos = obj.selectionEnd;
}
function getSel(tag)
{
  var oldString = "";	
  var i = 0;
  
  if(document.selection)
  {
  		oldString = document.selection.createRange().text;
  		
		if(oldString != "") 
		{
			document.selection.createRange().text = '[' + tag + ']' + oldString + '[/' + tag + ']';
		}
  } 
  else if(window.getSelection)
  {
		oldString = curSelVal;
		var newString = "";
		var finalString = "";
		var len = curSelVal.length; // length of current string

		
		if(len > 0 && document.update_form.tekst.value.length > 0) 
		{
			// get from beginning of string to start position
			var firstPart = oldString.substring(0, startPos);
			// get from end of selection to end of total string
			var lastPart = oldString.substring(endPos, len);
	
			// store the new string
			for (i=startPos; i<endPos; i++) 
			{
				newString += oldString[i];
			}
			// surround it with the proper tag
			finalString = '[' + tag + ']' + newString + '[/' + tag + ']';
	
			// rewrite it back into the textarea
			document.update_form.tekst.value = firstPart + finalString + lastPart;
		} 
		else 
		{
			curSelVal = "";
		}

  } 
  else if(document.getSelection)
  { 
		// don't know which browser would actually call this
		txt = obj.setSelectionRange(obj.selectionStart, obj.selectionEnd);
  } 
}
function swap(theId, newSrc) 
{
	document.getElementById(theId).src = newSrc;
}