White space beneath footer in asp.net site

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C#

Hello Friends,
i am developing one site for job portal in asp.net with C#.
in this i am using jquery.dd.js file for dropdown styles.
my problem is that white space is displaying beneath the footer.
wherever i use the dropdown,the extra white space is displaying beneath footer.
if i use the HTML select, white space will gone.
but if i use asp.net dropdown control, then white space is appear.

in IE browser, it is working fine.

any one help me to resolve this issue?

Regards,
Lalitha