function str_replace(search, replace, subject) {
    return subject.split(search).join(replace);
}

// JavaScript Document
YAHOO.get_middle_pic = function(){
		var $E = YAHOO.util.Event;
		var $D = YAHOO.util.Dom;
		var $ = $D.get;
		return {
			init :function() {
				var smallPics = $D.getElementsByClassName('im_rep');
				$E.on(smallPics,'mouseover',this.openMiddlePic);
			},
			openMiddlePic : function(e) {
				var picSource = this.getAttribute("src");
				var picArray = picSource.split("_klein");
				
				var picAlt = this.getAttribute("alt");
				
				var newJPG =  str_replace('.jpg', '.jpg', picArray[1]);
				var middlePic = document.getElementById("active_middle_pic");
				middlePic.setAttribute("src","images/photos_mittel" + newJPG);
				middlePic.setAttribute("alt",picAlt);
			}
			
		};
	}();




YAHOO.util.Event.addListener(window,'load',YAHOO.get_middle_pic.init,YAHOO.get_middle_pic,true);