/* clear searchbox-input field */
    function clear_text() {
        var search_input = document.getElementById("keyword");
        search_input.value = "";
    }  
    
    /* menu items - images changing */
    function set_image(id) {        
            var hidden_pic = document.getElementById("pic"+id);
            hidden_pic.style.visibility = "visible";
    }
    
    function unset_image(pic,id) {
           var hidden_pic = document.getElementById("pic"+id);
           hidden_pic.style.visibility = "hidden";
    }  
     function set_search_image(pic) {
        if(pic != "" ) {
            var hidden_pic = document.getElementById("pic"+id);
            
            hidden_pic.style.visibility = "visible";
        }
        var sub_but = document.getElementById("submit");
        var name = navigator.appName;
        if(name == "Microsoft Internet Explorer") {
            sub_but.style.background= "url(templates/images/arrow_hp_search.gif) 0px 4px no-repeat";
        } else {
            sub_but.style.background= "url(templates/images/arrow_hp_search.gif) top left no-repeat";
        }
    }

    function unset_search_image(pic) {
        if(pic != "") {
           var hidden_pic = document.getElementById("hidden_pic");
           hidden_pic.style.visibility = "hidden";
        }
        var sub_but = document.getElementById("submit");
        sub_but.style.background= "url(templates/images/btn_search.gif) 10px 15px no-repeat";
    }