Function udelukker anden function?

JScript kode 

 function stroke_calc() 
 {
 var i,s=[];
 for (i=0; i<=17; i++)
 {
   s[i]=validNum(document.form2["stroke"+i].value);
 }
 var s_out = s[0] + s[1] + s[2] + s[3] + s[4] + s[5] + s[6] + s[7] + s[8]; 
 var s_in = s[9] + s[10] + s[11] + s[12] + s[13]+ s[14] + s[15] + s[16] + s[17]; 
 
 document.form2.stroke_out.value = s_out;
 document.form2.stroke_in.value = s_in;
 document.form2.stroke_total.value = s_out + s_in;
 }
 
 var isNN = (navigator.appName.indexOf("Netscape")!=-1);
 function autoTab(input, e) {
 var keyCode = (isNN) ? e.which : e.keyCode; 
 var filter = (isNN) ? [0,8,9] : [0,8,9,16,17,18,37,38,39,40,46];
 if (input.value == 1) {
     if(input.value.length >= 2 && !containsElement(filter,keyCode)) {
         input.value = input.value.slice(0, 2);
         input.form[(getIndex(input)+1) % input.form.length].focus();
         input.form[(getIndex(input)+1) % input.form.length].select();
     }
 } else {
     if(input.value.length >= 1 && !containsElement(filter,keyCode)) {
         input.value = input.value.slice(0, 2);
         input.form[(getIndex(input)+1) % input.form.length].focus();
         input.form[(getIndex(input)+1) % input.form.length].select();
     }
 }
 
 function containsElement(arr, ele) {
     var found = false, index = 0;
     while(!found && index < arr.length)
     if(arr[index] == ele)
     found = true;
     else
     index++;
     return found;
 }
 function getIndex(input) {
     var index = -1, i = 0, found = false;
     while (i < input.form.length && index == -1)
     if (input.form[i] == input)index = i;
     else i++;
     return index;
 }
 return true;
 }

PHP kode 

 echo '<form name="form2">';
 
 for ($i = 0; $i <= 8; $i++) {
     echo '<input name="stroke'.$i.'" onKeyup="return autoTab(this, 1, event);stroke_calc();" class="style1" value="'.${'stroke'.$i}.'" maxlength="2"><br>';    
 }
 echo '<input name="stroke_out" readonly=true class="style2" value="0" onfocus="this.form.stroke9.focus();"><br>';
 for ($i = 9; $i <= 17; $i++) {
     echo '<input name="stroke'.$i.'" onKeyup="return autoTab(this, 1, event);stroke_calc();'.$matchCalc.'gir_calc();" class="style1" value="'.${'stroke'.$i}.'" maxlength="2"><br>';
 }
 
 echo '</form>';