<form id="searchform" action="http://YOURBLOG.blogspot.com/search" name="searchform" method="get">
<input id="ls" onfocus="if (this.value == 'Search...') {this.value = '';}" value="Search..." class="swap_value" name="s" onblur="if (this.value == '') {this.value = 'Search...';}" type="text"/>
<input id="searchsubmit" style="vertical-align: bottom;" src="http://4.bp.blogspot.com/_0CLPmP1ydOo/SYOXWHsCYAI/AAAAAAAAAis/aEXyQ2cAbfY/s1600/searchb.gif" value="Search" type="image"/>
</form>