Seach engine within the webpage

hi.. any1 can help out.. i dun reali understand how to do a search engine.. basically i haf a templates ready but i still dunno how to do it in dreamweaver.. Can any1 guide mi along to do.. I haf paste e code below..

<form action="search.jpg" name="searchForm">(i dun reali understand this part how i link within my webpage so dat i can search for words relating to my webpage.)
<div align="center"><b>Search the web ></b>
<input name="searchText" type="text" onkeypress="return checkKey()"/>
<input type="button" value="Search" onClick="return startSearch()"/>
<br>
</div>
</form>