Element.implement({ 
    clearFocusResetBlur: function(attr){ 
        var valueString = this.get(attr); 
        this.addEvents({ 
            'focus': function(){ 
                if( this.get('value') == valueString ) this.set('value',''); 
            }, 
            'blur': function(){ 
                if( this.get('value') == "" ) this.set('value',valueString); 
            } 
        }); 
    } 
}); 
window.addEvent('domready', function(){
	$$('#lienzo input').each(function(el){
		if(el.get('type')=='text' || el.get('type')=='password' ){ 
			el.clearFocusResetBlur('value');
		}
	}); 									  
});