multiple functions in onSubmit

Is it possible to run many functions in a form onSubmit?

Here is the javascript code (Dreamweaver MX user will have seen this before):

PHP Code:

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function MM_validateForm() { //v4.0
  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=MM_findObj(args[i]);
    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  == 'R') errors += '- '+nm+' is required.\n'; }
  } if (errors) alert('The following error(s) occurred:\n'+errors);
  document.MM_returnValue = (errors == '');
}

function fnCheckSelect() { 
    var v_Select = form1.selLocation.value;
    
    if (v_Select == "NONE"){
        alert("Please select a location.");
        return false;
    }
} 


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Then in my form I have the following code:

PHP Code:

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<form name="form1" method="post" action="/folder/mypage.php" onSubmit="MM_validateForm('Name','','R','Address','','R','City','','R','State','','R','Zip','','R','Email','','NisEmail');return document.MM_returnValue;return fnCheckSelect();"> 


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For some reason only the first 2 functions are run (MM_validateForm and document.MM_returnValue). Is there a limit or am I doing something wrong?

Thanks in advance for any advice.