function addListener(element,e,fn){  
             if(element.addEventListener){  
             element.addEventListener(e,fn,false);  
             } else {  
              element.attachEvent("on" + e,fn);  
              }  
            }  
            var f_search_text = document.getElementById("f_search_text");  
            addListener(f_search_text,"click",function(){  
                f_search_text.value = "";  
            })  
            addListener(f_search_text,"blur",function(){  
                f_search_text.value = "search by Keyword";  
            })