I have an input type=text for names in my HTML code. I need to make sure that it is a string with letters from 'a' to 'z' and 'A' to 'Z' only, along with space(s).

This is my HTML code:

<form action= name=f onsubmit=return f1()>

                Name : <input type=text name=name>

I'm expecting my JavaScript to be something like this:

function f1() 

{  

   var x=document.f.name.value;  

   ..... 

   ..... 

   return false;

}

PS: I'm not really familiar with Regular Expressions, so please do put up an explanation with the code.