/*________ Clear text________________________*/ 
function clearText(obj) {
if(obj.value==obj.defaultValue) obj.value='';
}
function revert(obj){
if(obj.value=='') obj.value=obj.defaultValue;
}
/*_____________ Limit text__________________*/ 
function limitText(limitField, limitNum) {
    if (limitField.value.length > limitNum) {
        limitField.value = limitField.value.substring(0, limitNum);
    }
     return true;  
}



/*_____________ disable enter key__________________*/  
function disableEnterKey(e)
{
     var key;     
     if(window.event)
          key = window.event.keyCode; //IE
     else
          key = e.which; //firefox     

     return (key != 13);
}