function paycheck() {
var nmbr = document.payform.item_number;
var amnt = document.payform.amount;
var missinginfo = "";

if ( nmbr.value == "") {missinginfo += "\n - Please Input the Invoice Number";}
if ( amnt.value == "") {missinginfo += "\n - Please Input the Invoice Amount";}

if (missinginfo != "") {
missinginfo ="Required information is missing: \n" 
+ "---------------------------------------------" +
missinginfo + "\n---------------------------------------------" +
"\nPlease complete and resubmit.";
alert(missinginfo);
return false;
}
else {
return true;
}
}