Search background color

Hi all, i have a search bar script but i can't add other background color. How can i modify my script to add a background color?

Script:
<form id="search" action="/search.forum" method="get"><p class="nomargin"><input type="text" onblur="if (this.value == '') this.value = 'Search...';" onclick="if (this.value == 'Search...') this.value = '';" value="Search..." class="inputbox search" maxlength="128" id="keywords" name="search_keywords"/><input type="submit" value="Search" class="button2"/></p></form>

<table width=100% cellpadding="0" cellspacing="0" border="0" bgcolor="#00000"><tr><form id="search" action="/search.forum" method="get"><p class="nomargin"><input type="text" onblur="if (this.value == '') this.value = 'Search...';" onclick="if (this.value == 'Search...') this.value = '';" value="Search..." class="inputbox search" maxlength="128" id="keywords" name="search_keywords"/><input type="submit" value="Search" class="button2"/></p></form></tr></table>

try this