function validar(which) {
	var pass=true;
		for (i=0;i<which.length;i++) {
		var tempobj=which.elements[i];
			if (tempobj.name.substring(0,9)=="requerido") {
				if (((tempobj.type=="text"||tempobj.type=="textarea")&&tempobj.value=='')||(tempobj.type.toString().charAt(0)=="s"&&tempobj.selectedIndex==0)) {
					pass=false;
					break;
         		}
      		}
   		}
	
	if (!pass) {
		nombreCorto=tempobj.name.substring(9,30).toUpperCase();
		alert("Please fill "+nombreCorto+".");
		tempobj.focus();
		
		return false;
	}else{
		return true;
	}
}
function emailCheck (emailStr) {
	var checkTLD=1;
	var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
	var emailPat=/^(.+)@(.+)$/;
	var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
	var validChars="\[^\\s" + specialChars + "\]";
	var quotedUser="(\"[^\"]*\")";
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	var atom=validChars + '+';
	var word="(" + atom + "|" + quotedUser + ")";
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
	var matchArray=emailStr.match(emailPat);

	if (matchArray==null) {
		alert("Email address seems incorrect.");
		document.formulario.requeridoemail.value="";
		document.formulario.requeridoemail.focus();
		return false;
	}
	
	var user=matchArray[1];
	var domain=matchArray[2];

	for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i)>127) {
			alert("The username contains invalid characters.");
			document.formulario.requeridoemail.value="";
			document.formulario.requeridoemail.focus();
			return false;
   		}
	}

	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) {
			alert("Ths domain name contains invalid characters.");
			document.formulario.requeridoemail.value="";
			document.formulario.requeridoemail.focus();
			return false;
   		}
	}

	if (user.match(userPat)==null) {
		alert("The username doesn't seem to be valid.");
		document.formulario.requeridoemail.value="";
		document.formulario.requeridoemail.focus();
	return false;
	}

	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
		for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				alert("The IP address is invalid");
				document.formulario.requeridoemail.value="";
				document.formulario.requeridoemail.focus();
				return false;
   			}
		}
		return true;
	}
 
	var atomPat=new RegExp("^" + atom + "$");
	var domArr=domain.split(".");
	var len=domArr.length;
	for (i=0;i<len;i++) {
		if (domArr[i].search(atomPat)==-1) {
			alert("Please enter a valid domain.");
			document.formulario.requeridoemail.value="";
			document.formulario.requeridoemail.focus();
			return false;
   		}
	}

	if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1) {
		alert("The address must end in a well-known domain or two letter " + "country.");
		document.formulario.requeridoemail.value="";
		document.formulario.requeridoemail.focus();
		return false;
	}

	if (len<2) {
		alert("This address is missing a hostname.");
		document.formulario.requeridoemail.value="";
		document.formulario.requeridoemail.focus();
		return false;
	}
	return true;
}