Registration Form Calculation

function dp(price) // Form:group - Totals Script //
{
   string = "" + price;
   number = string.length - string.indexOf('.');
   if (string.indexOf('.') == -1)
      return string;
   if (number == 1)
      return string;
   if (number == 2)
      return string;
   if (number > 3)
      return string.substring(0,string.length-number+3);
return string;
}
 
function calculate()
{
document.forms.onlinereg.elements["presentingTotal"].value = dp((document.forms.onlinereg.elements["presentingPrice"].value)*(document.forms.onlinereg.elements["presentingNum"].value));
document.forms.onlinereg.elements["titleTotal"].value = dp((document.forms.onlinereg.elements["titlePrice"].value)*(document.forms.onlinereg.elements["titleNum"].value));
document.forms.onlinereg.elements["classicTotal"].value = dp((document.forms.onlinereg.elements["classicPrice"].value)*(document.forms.onlinereg.elements["classicNum"].value));
document.forms.onlinereg.elements["corpTotal"].value = dp((document.forms.onlinereg.elements["corpPrice"].value)*(document.forms.onlinereg.elements["corpNum"].value));
document.forms.onlinereg.elements["golferTotal"].value = dp((document.forms.onlinereg.elements["golferPrice"].value)*(document.forms.onlinereg.elements["golferNum"].value));
//document.forms.onlinereg.elements["golfDinnerTotal"].value = dp((document.forms.onlinereg.elements["golfDinnerPrice"].value)*(document.forms.onlinereg.elements["golfDinnerNum"].value));
document.forms.onlinereg.elements["publicDinnerTotal"].value = dp((document.forms.onlinereg.elements["publicDinnerPrice"].value)*(document.forms.onlinereg.elements["publicDinnerNum"].value));
document.forms.onlinereg.elements["donationTotal"].value = dp((document.forms.onlinereg.elements["donationPrice"].value)*(document.forms.onlinereg.elements["donationNum"].value));
document.forms.onlinereg.elements["grandTotal"].value = dp(eval(document.forms.onlinereg.elements["titleTotal"].value) + eval(document.forms.onlinereg.elements["classicTotal"].value) + eval(document.forms.onlinereg.elements["corpTotal"].value) + eval(document.forms.onlinereg.elements["golferTotal"].value) + eval(document.forms.onlinereg.elements["publicDinnerTotal"].value) + eval(document.forms.onlinereg.elements["presentingTotal"].value) + eval(document.forms.onlinereg.elements["donationTotal"].value));
}
 
function creditChange() {
	document.onlinereg.creditChangeNum.value = "yes";
}
 
function MM_validateForm() { //v4.0
 
	if (document.getElementById){
    var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm.arguments;
 
		if (document.onlinereg.grandTotal.value == "0") {
			errors+='- Please select a sponsorship level.\n';
		}
 
    for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=document.getElementById(args[i]);
      if (val) { nm=val.alt; if ((val=val.value)!="") {
        if (test.indexOf('isEmail')!=-1) { p=val.indexOf('@');
          if (p<1 || p==(val.length-1)) errors+='- '+nm+' must contain an e-mail address.\n';
        } else if (test!='R') { num = parseFloat(val);
          if (isNaN(val)) errors+='- '+nm+' must contain a number.\n';
          if (test.indexOf('inRange') != -1) { p=test.indexOf(':');
            min=test.substring(8,p); max=test.substring(p+1);
            if (num<min || max<num) errors+='- '+nm+' must contain a number between '+min+' and '+max+'.\n';
      } } } else if (test.charAt(0) == 'R') errors += '- '+nm+' is required.\n'; }
    } if (errors) alert('The following error(s) occurred:\n'+errors);
    document.MM_returnValue = (errors == '');
} }