function checkFields(obj)
{
	formObj = document.form1
	var frm_src = obj	
	var errorMsg = ""
	var subForm = new Array("boat", "helm", "insurance", "tickets", "shirt", "hat", "favourite")
	
	var fieldNames = new Array("name", "class", "sail_number", "first_name",  "surname", "DOB", "gender", "nationality", "association", "street_address", "city", "country", "postocde", "telephone", "email", "company", "policy_no","amount", "expiry_date", "presentation_adult", "presentation_child", "size", "drink")
	
	for (var i = 0; i < formObj.elements.length; i++)
	{
		var elementName = formObj.elements[i].name
		var elementNameSplit = elementName.split("_")
		
		var elementGroup = ""
		var elementData = ""
				
		elementGroup = elementNameSplit[0]
		elementData = elementNameSplit[1]
						
		if(elementNameSplit.length > 2)
		{
				elementData = elementNameSplit[1] + "_" + elementNameSplit[2]
		}
			

		for (var j = 0; j < fieldNames.length; j++)
		{
			if(elementData == fieldNames[j])
			{
				
				if(formObj.elements[i].value == "")
				{
						errorMsg = "You have not completed the " + elementGroup + " " + elementData + " field."
				}	
			}	
		}
	}
	
		
	if(errorMsg != "")
	{
		alert(errorMsg)	
	}			 
	else
	{	
		document.form1.action = "../other_payment.php"			
		document.form1.submit()
	}
}