Thanks Eric for your response, but it does not solve the problem.
It may be due to the Struts tags i use. Normally i place the <logic> and <html:forms> tags inside the <table> tags but due to the logic of the page, i had to place the the <logic> and <html:forms> tags outside the <table> tags and maybe because of this, the spaces increases as the no. of rows returned increases.
Also this problem occurs in IE not in Mozilla
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