jQuery.fn.labelOver = function(overClass) {
	return this.each(function(){
		var label = jQuery(this);
		var f = label.attr('for');
		if (f) {
			var input = jQuery('#' + f);
			
			this.hide = function() {
			  //label.css({ textIndent: -10000 })
			  label.css('opacity','0.1')
			}
			
			this.show = function() {
			  if (input.val() == '') {label.css('opacity','0.9')}
			  //label.css({ textIndent: 0 }) 
			}
			
			this.cancella = function() {
			  //label.css({ textIndent: -10000 })
			  label.css('opacity','0')
			}
			
			// handlers
			input.focus(this.hide);
			input.blur(this.show);
			label.addClass(overClass).click(function(){ input.focus() });
			if (input.val() != '') this.cancella(); 
		}
	})
}