JavaScript SecondIndexOf or (x)indexOf

The JavaScript indexOf() and lastIndexOf() methods return the position of the first and last occurrence of a specified value in a string

You can learn more about them here

These can be very usefull, but what if you want the Second indexOf() to get the second occurrence of a specified value in a string. There is no standard JavaScript method for this, so I made my own one;

 function SecondIndexOf(Val, Str)  
 {  
   var Fst = Str.indexOf(Val);  
   var Snd = Str.indexOf(Val, Fst+1)  
   return Snd  
 }  

But why stop there, what if you want the third or fourth indexOf()
The following function lets you specify which occurrence of the specified value to find in the string;

 function xIndexOf(Val, Str, x)  
 {  
   if (x <= (Str.split(Val).length - 1)) {  
     Ot = Str.indexOf(Val);  
     if (x > 1) { for (var i = 1; i < x; i++) { var Ot = Str.indexOf(Val, Ot + 1) } }  
     return Ot;  
   } else { alert(Val + " Occurs less than " + x + " times"); return 0 }  
 }  

Here is an egsample of how you can use this;

   var PicPath = "/somedirectory/pics/";  
   var AppPath = picpath.substring(0, xIndexOf('/', PicPath, 2) + 1);  

Let me know if you found this usefull, or can recommend any enchancments.