function checkSubmit()
	{
	var myForm = document.form_contact;
	if (myForm.sender_name.value.length < 1)
		{
		alert ("Please provide your name.");
		myForm.sender_name.focus();
		return false;
		}
	if (myForm.sender_company.value.length < 1)
		{
		alert ("Please provide your company name.");
		myForm.sender_company.focus();
		return false;
		}
	if (myForm.sender_tel.value.length < 1)
		{
		alert ("Please provide your telephone number.");
		myForm.sender_tel.focus();
		return false;
		}
	if (myForm.sender_address.value.length < 1)
		{
		alert ("Please provide your address.");
		myForm.sender_address.focus();
		return false;
		}
	if (myForm.security_code.value.length < 1)
		{
		alert ("Please fill in the security code.");
		myForm.security_code.focus();
		return false;
		}
	else
		{
		if (confirm("Are you sure you want to submit?"))
			{
			myForm.btn_submit.value = 'Processing...';
			return true;
			}
		else
			{
			return false;
			}
		}
	}