var myAjaxProgressLoading = {
	
	start:function(){

		if($('progresoajax')){
			$('progresoajax').setStyles({
				'top':  Math.round(parseInt(Window.getHeight(),10)/2 - parseInt($('progresoajax').getStyle('height'),10)) + 'px',
				'left': Math.round(parseInt(Window.getWidth(),10)/2 - parseInt($('progresoajax').getStyle('width'),10)/2) + 'px'
			});
		}
		},
	
	showLoading:function(){
			if($('progresoajax')){
				$('progresoajax').setStyles({
					'visibility':'visible'
				});
			}
		},
		
	hideLoading:function(){
			if($('progresoajax')){
				$('progresoajax').setStyles({
					'visibility':'hidden'
				});
			}
		}
	};