function checkEnvioCV(f) {
	if(!f.nombre.value || !f.direccion.value || !f.ciudad.value || !f.cp.value || !f.pais.value || !f.telefono.value || !f.email.value || !f.cv.value) {
		alert(error_campos);
		return false;
	} else
		return true;
}


var TIMER = 5000;
function buildSlider() {

	$(".image_thumb ul li:first").addClass("active"); //Add the active class (highlights the very first list item by default)

	//runs function on click
	$(".image_thumb ul li").click(function(event) {
		event.preventDefault();
		$active = $(this);
		slideSwitchClick();
	})

	.hover(function(){ //Hover effects on list-item
		$(this).addClass("hover"); //Add class "hover" on hover
	}, function() {
		$(this).removeClass("hover"); //Remove class "hover" on hover out
	});

	//runs function, set timer here
	$(function() {
		//setInterval("slideSwitchTimed()", TIMER);
		playSlideshow = setInterval("slideSwitchTimed()", TIMER);
	});

	//pauses on hover
	$(".main_image").hover(function() {
		clearInterval(playSlideshow);
	},
	function() {
		playSlideshow = setInterval("slideSwitchTimed()", TIMER);
	});
}

function slideSwitchTimed() {
	$active = $(".image_thumb ul li.active").next();
	if($active.length == 0)
		$active = $(".image_thumb ul li:first"); //goes back to start when finishes
	slideSwitch();
}

function slideSwitchClick() {
	slideSwitch();
}

function slideSwitch() {
	var $prev = $(".image_thumb ul li.active");

	//Show active list-item
	$prev.removeClass("active");
	$active.addClass("active");

	//Set Variables
	var imgAlt = $active.find("img").attr("alt"); //Get Alt Tag of Image
	var imgTitle = $active.find("a").attr("href"); //Get Main Image URL

	if($(this).is(".active")) { //If the list item is active/selected, then...
		return false; // Don"t click through... Prevents repetitive animations on active/selected list-item
	} else { //If not active then...
		$(".main_image img").attr({ opacity: 0} );
		$(".main_image img").attr({ src: imgTitle , alt: imgAlt}).animate({ opacity: 1}, 250 );
	}

	return false;
}