javascript form validation not working

I have a form on my website that I'm trying to validate, I've tried many different methods for several hours, and I can't get it to work.

The form has a 3 digit number that people have to enter and currently if they don't enter anything and just click submit it still forwards them to the next webpage. I would like to make mandatory that they have to enter a code.

Any help would be greatly appreciated.

I'm pasting the codes I think are important:

Javascript code:

<script type="text/javascript">
<!--
function MM_preloadImages() { //v3.0
var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
if (a.indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a;}}
}

function MM_swapImgRestore() { //v3.0
var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a)&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[n];
for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers.document);
if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
if ((x=MM_findObj(a))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function senditout() {
document.form.submit();

}
function MM_callJS(jsStr) { //v2.0
return eval(jsStr)
}
function MM_validateForm() { //v4.0
if (document.getElementById){
var i,p,q,nm,test,num,min,max,errors='',args=MM_validateForm.arguments;
for (i=0; i<(args.length-2); i+=3) { test=args[i+2]; val=document.getElementById(args);
if (val) { nm=val.name; 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 == '');
} }
//-->
</script>

Form Code:

<form name="form" id="form" method="post" action="http://xxxxx.com/forward.php">
<input name="form" type="text" id="form" size="6" maxlength="3">

Code for Submit button:

<a href="#"><img src="images/1_01.jpg" alt="" width="228" height="70" id="Image1" onClick="MM_callJS('senditout();')" onMouseOver="MM_swapImage('Image1','','images/images/1_01.jpg',1)" onMouseOut="MM_swapImgRestore()"></a></td>


Thanks!

 

Doesn't go through all your code so i assume MM_validateForm is a function for form validation? If so, your code doesn't call it anywhere in submit section. All the submit code do is just submitting.

 

can you advise how I should revise the code? I didn't write the code, and I can't get in contact of the person designed the webpage.


any help would be appreciated