function validate_form()
{
	var mailExp  = /^([_&a-zA-Z0-9-]+(\.[_&a-zA-Z0-9-]+)*@[&a-zA-Z0-9-]+\.+[&a-zA-Z0-9-]+)/;

	if(document.careerForm.from.value=="")
	{
		alert("from can not be blank");
		document.careerForm.from.focus();
		return false;
	}
	if(document.careerForm.messrs.value=="")
	{
		alert("messrs can not be blank");
		document.careerForm.messrs.focus();
		return false;
	}
	if(document.careerForm.address1.value=="")
	{
		alert("address line can not be blank");
		document.careerForm.address1.focus();
		return false;
	}
	if(document.careerForm.post_town.value=="")
	{
		alert("post town can not be blank");
		document.careerForm.post_town.focus();
		return false;
	}
	if(document.careerForm.post_code.value=="")
	{
		alert("post code can not be blank");
		document.careerForm.post_code.focus();
		return false;
	}
	if(document.careerForm.telephone.value=="")
	{
		alert("telephone can not be blank");
		document.careerForm.telephone.focus();
		return false;
	}
	if(document.careerForm.email.value=="")
	{
		alert('email can not be blank');
		document.careerForm.email.focus();
		return false;
	}	
	if(document.careerForm.email.value !="" && 
		!mailExp.test(document.careerForm.email.value))
	{
		 alert("please enter valid e-mail");
		 document.careerForm.email.focus();
		 return false;
	}
	if(document.careerForm.ref.value=="")
	{
		alert("ref can not be blank");
		document.careerForm.ref.focus();
		return false;
	}
	if(document.careerForm.property_address.value=="")
	{
		alert('property address can not be blank');
		document.careerForm.property_address.focus();
		return false;
	}	
}