function show_sm(element){
           element.className += " hover_sm";
   }

function hide_sm(element){
           element.className = element.className.replace(/hover_sm/g, "");
     }
     
/* Clears searchbox' default value at onfocus */

function clearDefault(el){
    if (el.defaultValue==el.value) {
        el.value = "";
    }
}