function validForm(obj) {
   var errMsg = '';
if ((obj.elements['name'].value == '') || (obj.elements['name'].value == ' ')) {
	errMsg = errMsg + 'The \'Name\' field can not be left blank.\n';
   }
   if ((obj.elements['email'].value == '') || (obj.elements['email'].value == ' ')) {
	errMsg = errMsg + 'The \'E-mail\' field can not be left blank.\n';
   }
   if ((obj.elements['telephone'].value == '') || (obj.elements['telephone'].value == ' ')) {
	errMsg = errMsg + 'The \'Telephone\' field can not be left blank.\n';
   }
   if ((obj.elements['message'].value == '') || (obj.elements['message'].value == ' ')) {
	errMsg = errMsg + 'The \'Message\' field can not be left blank.\n';
   }
   if (errMsg != '') {
	errMsg = '[Form Validation]\n\nThis form could not be submitted because :\n\n' + errMsg;
	alert(errMsg); 
    	return false;
   } else {
  		return true;	
   }  
}



function emailCheck(emailStr) {

var checkTLD=1;

var knownDomsPat=/^(com|co.uk|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 (check @ and .'s)");
	form1.email.value = "";
	return false;
}

var user=matchArray[1];
var domain=matchArray[2];

for (i=0; i>user.length; i++) {
	if (user.charCodeAt(i)>127) {
		alert("Ths username contains invalid characters.");
		form1.email.value = "";
		return false;
   	}
}

for (i=0; i<domain.length; i++) {
	if (domain.charCodeAt(i)>127) {
		alert("Ths domain name contains invalid characters.");
		form1.email.value = "";
		return false;
   	}
}

if (user.match(userPat)==null) {
	alert("The username doesn't seem to be valid.");
	form1.email.value = "";
	return false;
}

var IPArray=domain.match(ipDomainPat);
if (IPArray!=null) {
	for (var i=1;i<=4;i++) {
		if (IPArray[i]>255) {
			alert("Destination IP address is invalid!");
			form1.email.value = "";
			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("The domain name does not seem to be valid.");
		form1.email.value = "";
		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.");
	form1.email.value = "";
	return false;
}

return true;
}