Allow only alphabets in a textbox using javascript

Example:



Code Sample:

<html> <head> <title>allwon only alphabets in textbox using JavaScript</title> <script language="Javascript" type="text/javascript"> function onlyAlphabets(e, t) { try { if (window.event) { var charCode = window.event.keyCode; } else if (e) { var charCode = e.which; } else { return true; } if ((charCode > 64 && charCode < 91) || (charCode > 96 && charCode < 123)) return true; else return false; } catch (err) { alert(err.Description); } } </script> </head> <body> <table align="center"> <tr> <td> <input type="text" onkeypress="return onlyAlphabets(event,this);" /> </td> </tr> </table> </body> </html>