how to define variable in jquery

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jQuery is just a javascript library that makes some extra stuff available when writing javascript – so there is no reason to use jQuery for declaring variables. Use “regular” javascript:

var name = document.myForm.txtname.value;
alert(name);

EDIT: As Canavar points out in his example, it is also possible to use jQuery to get the form value:

var name = $('#txtname').val(); // Yes, it's called .val(), not .value()

given that the text box has its id attribute set to txtname. However, you don’t need to use jQuery just because you can.

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