Only enter integer value in textbox with javascript

Here the code how its work
create one php file as numberonly.php

write function into your javascript file

function isNumberKey(evt) { var charCode = (evt.which) ? evt.which : event.keyCode

if (charCode > 31 && (charCode <> 57))
return false;
return true; }

put this function into textbox onkeypress event.
input type=text onkeypress=return isNumberKey(this.value)

Enjoy.. you will get the result.