/**
* Toogle image of object
*
* @param current
* @param parent
* @param img
*/
function toogleImage(current, parent, img){                     

    current = current.toLowerCase();    
    current = (current != "") ? "img_" + current.substr(current.lastIndexOf(".") +1, current.length) : "img_home";
     
    if(parent.id != current.toLowerCase()){
        parent.src = img;
    }     
}