function check(f) {
	var tick = f.terms.checked;
	
	if (tick == false) {
		MM_setTextOfTextfield('terms_msg','','You must agree to the terms and conditions to proceed')
		return false;
	}
	window.open('payment_instructions.htm','payment','scrollbars=yes,resizable=yes,width=600,height=450');
	return true;
}

function MM_setTextOfTextfield(objName,x,newText) { //v3.0
  var obj = MM_findObj(objName); if (obj) obj.value = newText;
}