function setFocus( that) {  
    that._defaultValue = that.value;  
    that.value = '';
    that.style.color = '#000';
    that.onblur = function() {  
        if( that.value === '' ) {  
        	that.style.color = '#999';
            that.value = that._defaultValue;  
        }  
    }  
    that.onfocus = function() {  
        if( that.value === that._defaultValue ) { 
            that.style.color = '#000';
            that.value = '';  
        }  
    }  
}