function formatUPC(upc) {

	var len = upc.length;
	if (len == 10) {
		return(upc)
	}
	else if (len == 6) {
		 switch(upc.slice(5,6)) {
		 	case "0":
		 		return(upc.slice(0,2) + "00000" + upc.slice(2,5))
		 		break;
		 	case "1":
		 		return(upc.slice(0,2) + "10000" + upc.slice(2,5))
		 		break;
		 	case "2":
		 		return(upc.slice(0,2) + "20000" + upc.slice(2,5))
		 		break;
		 	case "3":
		 		return(upc.slice(0,3) + "00000" + upc.slice(3,5))
		 		break;
		 	case "4":
		 		return(upc.slice(0,4) + "00000" + upc.slice(4,5))
		 		break;
		 	case "5":
		 		return(upc.slice(0,5) + "000005")
		 		break;
		 	case "6":
		 		return(upc.slice(0,5) + "000006")
		 		break;
		 	case "7":
		 		return(upc.slice(0,5) + "000007")
		 		break;
		 	case "8":
		 		return(upc.slice(0,5) + "000008")
		 		break;
		 	case "9":
		 		return(upc.slice(0,5) + "000009")
		 		break;	
		 }
	}
	else {
		alert("Invalid UPC code entered")
		return(false)
	}
}