function wwTextReplacement() {

    var self = this;

    this.rpcUrl = "/rpc.php?action=replace_text";
    this.cachePath = "/static/img/cache/";

    this.replacements = new Object();

    this.addReplacement = function ( items_name, item ) {

        if( typeof this.replacements[items_name] == "undefined" ) {

		    this.replacements[items_name] = new Array();
        }

        this.replacements[items_name].push( item );

    }

   this.replaceText = function ( items_name ) {
      if (  typeof this.replacements[items_name] == "undefined"
         || this.replacements[items_name].length == 0 ) {
         return false;
      }

      for ( var i = 0; i < this.replacements[items_name].length; i++) {
         var curr = this.replacements[items_name][ i ];
         var elems = new Array();

         if ( typeof curr.dontselect != 'undefined' && curr.dontselect != '' && curr.dontselect ) {
            elems = $(curr.selector).not($(curr.dontselect));
         }
         else {
            elems = $(curr.selector);
         }

         if( elems.length > 0 ) {
            for( var j = 0; j < elems.length; j++ ) {
               if( !elems[ j ] )
                  continue ;

               if ($(elems[j]).data("has_replacement") == true)
                  continue;
               $(elems[j]).data("has_replacement", true);

               var text = this.extractText( elems[ j ] );
               text = this.trim(text);

               while( elems[j].hasChildNodes() ) {
                  elems[j].removeChild(elems[j].firstChild);
               }

               var tokens = curr.wordwrap ? text.split(' ') : [text];

               for( var k = 0; k < tokens.length; k++ ) {
                  //curr.params1.text = escapeText( tokens[k] ) + ' ';
                  //curr.params2.text = escapeText( tokens[k] ) + ' ';

                  curr.params1.text = tokens[k] + ' ';
                  if ( curr.params2 )
                  curr.params2.text = tokens[k] + ' ';

                  var elem = $(elems[j]);

                  var img = $('<img class="replacement" />');
                  img.attr('alt', tokens[k]+' ');

                  var src1 = this.rpcUrl + '&' + jQuery.param(curr.params1);
                  img.attr('src' , src1);
                  img.data('src1' , src1);
                  elem.data('src1', src1);

                  // hover bild?
                  if ( curr.params2 ) {
                  var src2 = this.rpcUrl + '&' + jQuery.param(curr.params2);
                  img.data('src2', src2);
                  elem.data('src2', src2);

                  elem.bind('mouseenter',function() {
                  $('img.replacement', $(this) ).attr('src', $(this).data('src2'));
                  });

                  elem.bind('focus',function() {
                  $('img.replacement', $(this) ).attr('src', $(this).data('src2'));
                  });

                  elem.bind('mouseleave',function() {
                  $('img.replacement', $(this) ).attr('src', $(this).data('src1'));
                  });

                  elem.bind('blur',function() {
                  $('img.replacement', $(this) ).attr('src', $(this).data('src1'));
                  });
                  }

                  elem.append(img);
               }
            }
         }
      }
   }

   this.extractText = function ( element ) {
      if(typeof element == "string")
         return element;
      else if(typeof element == "undefined")
         return element;

    	var text = "";
    	var kids = element.childNodes;

    	for( var i = 0; i < kids.length; i++ ) {
    		if( kids [ i ].nodeType == 1 )
       		text += this.extractText( kids [ i ] );
    		else if( kids[ i ].nodeType == 3 )
       		text += kids [ i ].nodeValue;
    	}
    	return text;
   }

   this.trim = function ( text ) {
      return(text.replace(/\s+/g," ").replace(/\s+$/,"").replace(/^\s+/,""));
   }
}