function isValid(form) {

	if ((!form.FirstName1.value)) {
		alert("This field cannot be empty!");
		form.FirstName1.focus();
		form.FirstName1.select();
		return false;
	} 
	if ((!form.LastName1.value)) {
		alert("This field cannot be empty!");
		form.LastName1.focus();
		form.LastName1.select();
		return false;
	}  
	if ((!form.Phone1.value)) {
		alert("This field cannot be empty!");
		form.Phone1.focus();
		form.Phone1.select();
		return false;
	}  
	if ((!form.Email1.value)) {
		alert("This field cannot be empty!");
		form.Email1.focus();
		form.Email1.select();
		return false;
	}	
	
	if ((form.Email1.value) && (form.Email1.value.indexOf ('@',0) == -1 || form.Email1.value.indexOf ('.',0) == -1))
{
alert("\nInvalid data!")
 document.getElementById('Email1').select();
 document.getElementById('Email1').focus();
return false;
}


	if (form.SourceHeard.value=="0") {
		alert("This field cannot be empty!");
		form.SourceHeard.focus();
		return false;
	}	
	return true;
}