String.prototype.trim = function() {
a = this.replace(/^\s+/, '');
return a.replace(/\s+$/, '');
};

function ValidateForm(){
    var str=document.contactform.isk_email.value;
	var lname = document.contactform.isk_lastname.value;
	var phone = document.contactform.isk_phone.value;
	    var phoneTrim = phone.trim();
	var email = document.contactform.isk_email.value;
	var regexps =new RegExp(/^[a-zA-Z0-9]+([\_\-\.]*[a-zA-Z0-9]+[\_\-]?)*@[a-zA-Z0-9]+([\_\-]?[a-zA-Z0-9]+)*\.+([\-\_]?[a-zA-Z0-9])+(\.?[a-zA-Z0-9]+)*$/)
	if(lname.trim()==''){
		alert("Last name required..");
		return false;
	}
	if(phone.trim()=='' && email.trim()=='') {
	    alert("Please enter your phone number or email address");
	    return false;
	}
	if(phoneTrim.length > 0 && phoneTrim.length < 10) {
	    alert("Please enter a valid phone number");
	    return false;
	}
	if (regexps.test(str) || (str == '')) {
		document.contactform.submit();
	}
        else
	{
                alert('Invalid Email Id');
		return false;
	}	

}