function showhide(id){
	if (document.getElementById){
		obj = document.getElementById(id);
		obj.style.display = "";
		opacity(id, 0, 98, 500);
	}
}

function hidediv(id){
	if (document.getElementById){
		obj = document.getElementById(id);
		obj.style.display = "none";
		opacity(id, 98, 0, 500);
	}
}

function opacity(id, opacStart, opacEnd, millisec) {
	//speed for each frame
	var speed = Math.round(millisec / 100);
	var timer = 0;

	//determine the direction for the blending, if start and end are the same nothing happens
	if(opacStart > opacEnd) {
		for(i = opacStart; i >= opacEnd; i--) {
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	} else if(opacStart < opacEnd) {
		for(i = opacStart; i <= opacEnd; i++)
			{
			setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
			timer++;
		}
	}
}

//change the opacity for different browsers
function changeOpac(opacity, id) {
	var object = document.getElementById(id).style; 
	object.opacity = (opacity / 100);
	object.MozOpacity = (opacity / 100);
	object.KhtmlOpacity = (opacity / 100);
	object.filter = "alpha(opacity=" + opacity + ")";
}

function shiftOpacity(id, millisec) {
	//if an element is invisible, make it visible, else make it ivisible
	if(document.getElementById(id).style.opacity == 0) {
		opacity(id, 0, 100, millisec);
	} else {
		opacity(id, 100, 0, millisec);
	}
}

function blendimage(divid, imageid, imagefile, millisec) {
	var speed = Math.round(millisec / 100);
	var timer = 0;
	
	//set the current image as background
	document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";
	
	//make image transparent
	changeOpac(0, imageid);
	
	//make new image
	document.getElementById(imageid).src = imagefile;

	//fade in image
	for(i = 0; i <= 100; i++) {
		setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
		timer++;
	}
}

function currentOpac(id, opacEnd, millisec) {
	//standard opacity is 100
	var currentOpac = 100;
	
	//if the element has an opacity set, get it
	if(document.getElementById(id).style.opacity < 100) {
		currentOpac = document.getElementById(id).style.opacity * 100;
	}

	//call for the function that changes the opacity
	opacity(id, currentOpac, opacEnd, millisec)
}


var mostrarContenido = function($destino) {

		new Ajax.Updater('contenido',
			$destino,{
				method: 'post',
				onFailure: function(){
				alerta('Error: El servicio no esta disponible');
				   					
							},
				onSuccess: function(){
					$('contenido').appear();
					$('apDiv1').innerHTML = "";
					return false;
				},
				onLoading: function(transport) {
					$('apDiv1').innerHTML = "<img src='img/ajax-loader(3).gif' /> Procesando ...";
				}

				
				
			});
 	}
 	
function validarForm(form,funcion) {
						var valid = new Validation(form,{onSubmit:false,useTitles:true,stopOnFirst:true,immediate:true});
						var result = valid.validate();
						
						if(result) {
							funcion();
						}
					}