function setFocus( that) {  
        that._defaultValue = that.value;  
        that.value = '';  
        that.onblur = function() {  
            if( that.value === '' ) {  
                that.value = that._defaultValue;  
            }  
        }  
        that.onfocus = function() {  
            if( that.value === that._defaultValue ) {  
                that.value = '';  
            }  
        }  
    }