function urlencode(str) {
	return escape(str).replace(/\+/g,'%2B').replace(/%20/g, '+').replace(/\*/g, '%2A').replace(/\//g, '%2F').replace(/@/g, '%40');
}
function search(form) {
if (document.pressed == 'Google')
	window.location = 'http://www.google.com/search?hl=en&q='+urlencode(form.string.value)+'&btnG=Google+Search\n\n';
if (document.pressed == 'Wikipedia')
	window.location = 'http://en.wikipedia.org/wiki/Special:Search?search='+urlencode(form.string.value)+'&go=Go\n\n';
if (document.pressed == 'Amazon')
	window.location = 'http://www.amazon.com/s/?field-keywords='+urlencode(form.string.value)+'&tag=walsranfes08-20\n\n';
if (document.pressed == 'eBay')
	window.location = 'http://www.ebay.com/sch/i.html?_nkw='+urlencode(form.string.value)+'&category0=\n\n';
if (document.pressed == 'YouTube')
	window.location = 'http://youtube.com/results?search_query='+urlencode(form.string.value)+'&search_type=&aq=f\n\n';
if (document.pressed == 'Dictionary')
	window.location = 'http://dictionary.reference.com/search?q='+urlencode(form.string.value)+'\n\n';
return false;
}

<form action="/modules/search.php" onsubmit="return search(this)" id="searchbox" class="floor center">
<div>
<input maxlength="256" class="searchtext roundtr roundtl" name="string" type="text" value="" autofocus="autofocus" tabindex="1" />
<!-- br / -->
</div><div>

<input type="submit" name="engine" onclick="document.pressed=this.value" value="Google" class="roundbl roundbr" />
<input type="submit" name="engine" onclick="document.pressed=this.value" value="Wikipedia" class="roundbl roundbr" />
<input type="submit" name="engine" onclick="document.pressed=this.value" value="Amazon" class="roundbl roundbr" />
<input type="submit" name="engine" onclick="document.pressed=this.value" value="eBay" class="roundbl roundbr" />
<input type="submit" name="engine" onclick="document.pressed=this.value" value="YouTube" class="roundbl roundbr" />
<input type="submit" name="engine" onclick="document.pressed=this.value" value="Dictionary" class="roundbl roundbr" />
</div>
</form>

<script type="text/javascript" src="/modules/search.php?js=1"></script>