function generate_fields ( inform ) {
  var thismodel = inform.modelpick.options[inform.modelpick.selectedIndex].value;
  var sku       = '';

  
// a conditional H*A*C*K - array not worth the effort

	if (thismodel == '1') { sku = '13117:1,'; }
	if (thismodel == '2') { sku = '13118:1,'; }
	if (thismodel == '5') { sku = '13123:1,'; }
	if (thismodel == '6') { sku = '13124:1,'; }
	if (thismodel == '7') { sku = '13125:1,'; }

	
	if (inform.add_eartips.checked == true && thismodel == '3') {
		sku += '13119:2,';
	}
	if (inform.add_eartips.checked == true && thismodel != '3') {
		sku += '13119:1,';
	}
	if (inform.add_eartips.checked != true && thismodel == '3') {
		sku += '13119:1,';
	}
	
	if (inform.add_eartipslg.checked == true && thismodel == '4') {
		sku += '13122:2,';
	}
	if (inform.add_eartipslg.checked == true && thismodel != '4') {
		sku += '13122:1,';
	}
	if (inform.add_eartipslg.checked != true && thismodel == '4') {
		sku += '13122:1,';
	}
	
	if (inform.add_audiosplit.checked == true) {
		sku += '13757:1,';
	}
	if (inform.add_audiosplitb.checked == true) {
		sku += '13751:1,';
	}

  inform.ProdList.value = sku;
}

function handleform ( inform ) {
 var errmsg = '';

// NB: secondary conditional statements below are due to NN 4.x hack
 if ( inform.modelpick.options[inform.modelpick.selectedIndex].value == '') { errmsg += 'Please Select a Model before trying to purchase.'; }

 if ( errmsg ) { alert (errmsg); return false; }
 else { generate_fields( inform ); return true; }
}