var bugchars = '!#$^&*()+|}{[]?><~%:;/,=`"\'';
function CharsInBag(s)
{   var i;
var lchar="";
    // Search through string's characters one by one.
    // If character is not in bag.
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
		if(i>0)lchar=s.charAt(i-1)
        if (bugchars.indexOf(c) != -1 || (lchar=="." && c==".")) return false;
    }
    return true;
}
function isInteger(s)
{   var i;
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is not a number.
        var c = s.charAt(i);
        if ((c >= "0") && (c <= "9") && (c != ".")) return false;
    }
    // All characters are numbers.
    return true;
}
function echeck(str) {
		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		var lastdot=str.lastIndexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("e-mail invalido")
		   return false
		}
		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("e-mail invalido")
		   return false
		}
		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr || str.substring(lastdot+1)==""){
		    alert("e-mail invalido")
		    return false
		}
		 
		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("e-mail invalido")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("e-mail invalido")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("e-mail invalido")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("e-mail invalido")
		    return false
		 }
		if(CharsInBag(str)==false){
		    alert("e-mail invalido")
		    return false
		 }
		 var arrEmail=str.split("@")
		 var ldot=arrEmail[1].indexOf(".")
		 if(isInteger(arrEmail[1].substring(ldot+1))==false){
		    alert("e-mail invalido")
		    return false
		 }
 		 return true					
	}
function Validar(){
	var nombre=document.contact.nombre
	var coment=document.contact.coment
	var emailID=document.contact.dir
	
	if ((nombre.value==null)||(nombre.value=="")){
		alert("Por favor, introduzca un nombre")
		nombre.focus()
		return false	
	}
	
	
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Por favor, introduzca un e-mail")
		emailID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	
	if ((coment.value==null)||(coment.value=="")){
		alert("Por favor, introduzca un comentario")
		coment.focus()
		return false	
	}
	
	
	return true
 }
 function Validar_News(){
	var emailID=document.contact.dir
	
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Por favor, introduzca un e-mail")
		emailID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}

	return true
 }