function contenido( op ){

	switch(op){
		case "first" : if (window.XMLHttpRequest) { // Mozilla, Safari, ...
        					ajax = new XMLHttpRequest();
    				    	}
				    	else if (window.ActiveXObject) { // Internet Explorer
						ajax = new ActiveXObject("Microsoft.XMLHTTP");
				    	}
					
					ajax.open('GET','menu/menu-horizontal-css.html',true);
					ajax.onreadystatechange = function() {
						if (ajax.readyState == 4) {
						document.getElementById('menu').innerHTML = ajax.responseText
						}
					}
					
					ajax.send(null);
		break;
		case "home" : if (window.XMLHttpRequest) { // Mozilla, Safari, ...
        					ajax = new XMLHttpRequest();
    				    	}
				    	else if (window.ActiveXObject) { // Internet Explorer
						ajax = new ActiveXObject("Microsoft.XMLHTTP");
				    	}
					
					ajax.open('GET','home.html',true);
					ajax.onreadystatechange = function() {
						if (ajax.readyState == 4) {
						document.getElementById('imagenes').innerHTML = ajax.responseText
						}
					}
					
					ajax.send(null);

		 break;
		case "qs": if (window.XMLHttpRequest) { // Mozilla, Safari, ...
        					ajax = new XMLHttpRequest();
    				    	}
				    	else if (window.ActiveXObject) { // Internet Explorer
						ajax = new ActiveXObject("Microsoft.XMLHTTP");
				    	}
					
					ajax.open('GET','QuienesSomos.html',true);
					ajax.onreadystatechange = function() {
						if (ajax.readyState == 4) {
						document.getElementById('imagenes').innerHTML = ajax.responseText
						}
					}
					
					ajax.send(null);

		 break;
		case "services" :if (window.XMLHttpRequest) { // Mozilla, Safari, ...
        					ajax = new XMLHttpRequest();
    				    	}
				    	else if (window.ActiveXObject) { // Internet Explorer
						ajax = new ActiveXObject("Microsoft.XMLHTTP");
				    	}
					
					ajax.open('GET','Servicios.html',true);
					ajax.onreadystatechange = function() {
						if (ajax.readyState == 4) {
						document.getElementById('imagenes').innerHTML = ajax.responseText
						}
					}
					
					ajax.send(null);
		break;
		case "contact" : if (window.XMLHttpRequest) { // Mozilla, Safari, ...
        					ajax = new XMLHttpRequest();
    				    	}
				    	else if (window.ActiveXObject) { // Internet Explorer
						ajax = new ActiveXObject("Microsoft.XMLHTTP");
				    	}
					
					ajax.open('GET','contacto.php',true);
					ajax.onreadystatechange = function() {
						if (ajax.readyState == 4) {
						document.getElementById('imagenes').innerHTML = ajax.responseText
						}
					}
					
					ajax.send(null);
		break;
		case "imagenes_" :  	if (window.XMLHttpRequest) { // Mozilla, Safari, ...
        					ajax = new XMLHttpRequest();
    				    	}
				    	else if (window.ActiveXObject) { // Internet Explorer
						ajax = new ActiveXObject("Microsoft.XMLHTTP");
				    	}
					
					ajax.open('GET','mini-galleries.html',true);
					ajax.onreadystatechange = function() {
						if (ajax.readyState == 4) {
						document.getElementById('imagenes').innerHTML = ajax.responseText
						}
					}
					
					ajax.send(null);
		break;
		
	}
	
}

function validar(form){
			
			if(form.Nombre.value==''){
				alert("Debe escribir su nombre.");
				form.Nombre.focus();
				return false;
			}
			
			if(form.Email.value==''){
				alert("Debe escribir su E-Mail.");
				form.Email.focus();
				return false;
			}
			if (VerificarMail(form.Email.value) == false){ 
			 	alert('Email Incorrecto'); 
			 	form.Email.focus();
			 	return false; 
			}
			if(form.Asunto.value==''){
				alert("Debe escribir un Asunto.");
				form.Asunto.focus();
				return false;
			}
			if(form.Texto.value==''){
				alert("Debe escribir un Texto.");
				form.Texto.focus();
				return false;
			}
// 			return true;
			sendMail();
}
function VerificarMail(strMail) {
					var patMail = /^(.+)@(.+)$/;
					var patUser = /^[a-zA-Z\d_-]+(\.[a-zA-Z\d_-]+)*$/;
					var patDomainIP = /^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/;
					var patDomain = /^[a-zA-Z\d_-]+(\.[a-zA-Z\d_-]+)+$/;
					var matchArray = strMail.match(patMail);
					if(matchArray == null){
						return false;
					}
					var user = new String(matchArray[1]);
					var domain = new String(matchArray[2]); 
					if(user.match(patUser) == null){
						return false;
					}
					var IPArray = domain.match(patDomainIP);
					if(IPArray != null){ 
						 for (var i=1;i<=4;i++) 
						 {
						  if(IPArray[i]>255)
						  {
						   return false;
						  }
						 }
						 return true; 
					}
					var domainArray = domain.match(patDomain);
					if(domainArray == null) {
						return false;
					}
					if(domainArray[domainArray.length - 1].length < 3 || domainArray[ domainArray.length - 1].length > 5) { 
						return false;
					}
					return true;
}

function sendMail(){
	document.contacto.submit();
	alert("formulario enviado");
// 	if (window.XMLHttpRequest) { 
// 				
//         				ajax = new XMLHttpRequest();
//     				    	}
// 				    	else if (window.ActiveXObject) { // Internet Explorer
// 						ajax = new ActiveXObject("Microsoft.XMLHTTP");
// 				    	}
// 					
// 					ajax.open('GET','send.php',true);
// 					ajax.onreadystatechange = function() {
// 						if (ajax.readyState == 4) {
// 						document.getElementById('imagenes').innerHTML = ajax.responseText
// 						}
// 					}
// 					
// 					ajax.send(null);
		
}