function ClearInput(form) {
form.attendance.value="";
form.trade8.value="";
form.trade10.value="";
return true;
}
function help(nothingentered) {
if (nothingentered == "attendance")
alert("Enter the number of exhibitors attending your event.")
}
function SizeCalc(form) {
var trade8 = 0;
var trade10 = 0;
if (form.attendance.value==null||form.attendance.value.length==0){
        alert("Please enter the number of exhibitors attending.");
        return false;}
        else
        attendance = form.attendance.value
form.trade8.value = (attendance * 80) * 2;
form.trade10.value = (attendance * 100) * 2;
return true;
}