function checkform(){
	errors = false;

	nombre = $('#nombre').val();
	apellidos = $('#apellidos').val();
	empresa = $('#empresa').val();
	tel = $('#tel').val();
	email= $('#email').val();
	politica = $('#politica').is(":checked");
	
	$('#errorshow').html('Por favor, revise los siguientes campos:<br />');
	
	if(nombre == ""){
		$('#nombre').addClass('errorbox');
		$('#errorshow').append('- Nombre<br />');
		errors = true;
	} else {
		$('#nombre').removeClass('errorbox');		
	}
	
	if(apellidos == ""){
		$('#apellidos').addClass('errorbox');
		$('#errorshow').append('- Apellidos<br />');
		errors = true;
	} else {
		$('#apellidos').removeClass('errorbox');		
	}
	
	if(empresa == ""){
		$('#empresa').addClass('errorbox');
		$('#errorshow').append('- Empresa<br />');
		errors = true;
	} else {
		$('#empresa').removeClass('errorbox');		
	}
	
	if(tel == ""){
		$('#tel').addClass('errorbox');
		$('#errorshow').append('- Telefono<br />');
		errors = true;
	} else {
		$('#tel').removeClass('errorbox');		
	}
	
	if(email == ""){
		$('#email').addClass('errorbox');
		$('#errorshow').append('- Email<br />');
		errors = true;
	} else {
		arroba = email.indexOf('@');
		punto = email.indexOf('.');
		if (arroba<1 || arroba > email.length-6 || punto<1 || punto > email.length-3)
		{
			$('#email').addClass('errorbox');
			$('#errorshow').append('- Email<br />');
			errors = true;
		} else {
			$('#email').removeClass('errorbox');
		}
	}
	
	if (!politica) {
		$('#politica').addClass('errorbox');
		$('#errorshow').append('- Debe aceptar la política de privacidad.<br />');
		errors = true;
	}
	
	if (errors == false) $('#errorshow').html('');
	
	
	return errors;	
}

	function showPop() {
		document.getElementById('popVentana').style.display="";
		var h = getPageSize()[1];
		
		var combos = document.getElementsByTagName("select");
		for(var i=0;i<combos.length;i++){
		       combos[i].style.display = "none";
		}
	}
	
	
	function hidePop(){
		document.getElementById('popVentana').style.display="none";
		
		var combos = document.getElementsByTagName("select");
		for(var i=0;i<combos.length;i++){
		       combos[i].style.display = "";
		}
	}
	
	function getPageSize(){
	
		var xScroll, yScroll;
	
		if (window.innerHeight && window.scrollMaxY) {	
			xScroll = window.innerWidth + window.scrollMaxX;
			yScroll = window.innerHeight + window.scrollMaxY;
		} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
			xScroll = document.body.scrollWidth;
			yScroll = document.body.scrollHeight;
		} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
			xScroll = document.body.offsetWidth;
			yScroll = document.body.offsetHeight;
		}
	
		var windowWidth, windowHeight;
		
		//	console.log(self.innerWidth);
		//	console.log(document.documentElement.clientWidth);
	
		if (self.innerHeight) {	// all except Explorer
			if(document.documentElement.clientWidth){
				windowWidth = document.documentElement.clientWidth; 
			} else {
				windowWidth = self.innerWidth;
			}
			windowHeight = self.innerHeight;
		} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
			windowWidth = document.documentElement.clientWidth;
			windowHeight = document.documentElement.clientHeight;
		} else if (document.body) { // other Explorers
			windowWidth = document.body.clientWidth;
			windowHeight = document.body.clientHeight;
		}	
		
		// for small pages with total height less then height of the viewport
		if(yScroll < windowHeight){
			pageHeight = windowHeight;
		} else { 
			pageHeight = yScroll;
		}
	
		//	console.log("xScroll " + xScroll)
		//	console.log("windowWidth " + windowWidth)
	
		// for small pages with total width less then width of the viewport
		if(xScroll < windowWidth){	
			pageWidth = xScroll;		
		} else {
			pageWidth = windowWidth;
		}
		//	console.log("pageWidth " + pageWidth)
	
		arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
		return arrayPageSize;
		}