// JavaScript Document

function valida_envia(){


	
    //valido el nombre
    if (document.form1.nombre.value.length==0){
       alert("Please enter your name")
       document.form1.nombre.focus()
       return 0;
    } 
	
	//valido el email
	var filter=/^[A-Za-z_.][A-Za-z0-9_.]*@[A-Za-z0-9_]+\.[A-Za-z0-9_.]+[A-za-z]$/;
if(document.form1.email.value == "")	{
				alert("Please enter your email");
				document.form1.email.focus();
				return 0;
			}
			if (!filter.test(document.form1.email.value))	{
				alert("Enter a valid email address");
				document.form1.email.select();
				document.form1.email.focus();
				return 0;
			}	
	 
	
	
	
	 //valido el language
    if (document.form1.language.value.length==0){
       alert("Please have to write their language")
       document.form1.language.focus()
       return 0;
    }  

	 
	//valido el comentario
   if (document.form1.comentarios.value.length==0){
       alert("Please enter your comment")
       document.form1.comentarios.focus()
       return 0;
    }

	
 //el formulario se envia
    alert("Gracias \ Thanks \n Atte: OleHola");
    document.form1.submit(); 
	}