function submitIt(form) {
var maxLength = 16;
             if (form.cust_name_billing.value == "") {
              alert("Please enter your first name for billing!")
              return false
              }
	  
	      if (form.cust_surname_billing.value == "") {
              alert("Please enter your second name for billing!")
              return false
              }  

	      if (form.email_billing.value == "") {
              alert("Please enter your email address for billing!")
              return false
              }    
			  
	      if (form.cust_address1_billing.value == "") {
              alert("Please enter the first line of your billing address!")
              return false
              }    
			  
	      if (form.city_billing.value == "") {
              alert("Please enter your city for billing!")
              return false
              }    

	      if (form.zipcode_billing.value == "") {
              alert("Please enter your zipcode for billing!\n If you have no zipcode, please enter None")
              return false
              }    
			  
	      if (form.credit_card_no.value == "") {
              alert("Please enter your credit number!")
              return false
              }    			  
			  
	      if (form.expiry_date.value == "") {
              alert("Please enter your credit card expiry date!")
              return false
              }    						  
			  
	      if (form.country_billing.value == "") {
              alert("Please select a country!")
              return false
              }    		

             if (form.cust_name_shipping.value == "") {
              alert("Please enter your first name for shipping!")
              return false
              }
	  
	      if (form.cust_surname_shipping.value == "") {
              alert("Please enter your second name for shipping!")
              return false
              }  

	      if (form.email_shipping.value == "") {
              alert("Please enter your email address for shipping!")
              return false
              }    
			  
	      if (form.cust_address1_shipping.value == "") {
              alert("Please enter the first line of your shipping address!")
              return false
              }    
			  
	      if (form.city_shipping.value == "") {
              alert("Please enter your city for shipping!")
              return false
              }    

	      if (form.zipcode_shipping.value == "") {
              alert("Please enter your zipcode for shipping!\n If you have no zipcode, please enter None")
              return false
              }    			  
	      if (form.country_shipping.value == "") {
              alert("Please select a country for shipping!")
              return false
              }    
			if (form.credit_card_no.length < maxLength){
			alert("Your credit card number is incorrect")
			return false
			}
			  
	     return true
     }