number validation using jquery


I need a code that when a user enters any thing that is not a number, and move from one input to another (lost focus), if is not a number, then erase that value and put a text under the input box,  or when the user is typing if is possible and start writing anything different that a number, the text appears under the input box and if the error persist when lost focus then erase the text, any idea?
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Rainer JeschorCommented:
for this you normally use a jQuery plugin for validation. I would not replace/remove anything during the user entering action - this will really frustrate and astonish users, but validate the field on focus out and on form submit.
There are many validation plugins - so I just want to link to three of them:
The standard plugin for validation
Cool and flexible
Form validation

Sample using jQueryValidation:


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