Need a wordpress custom search with drop down option

I am working on making a search form with drop down option so that i can restrict the search to certain category, state, city or zip code within my website.

I have this code please provide solution,

<input type="text" value="<?php echo wp_specialchars($s, 1); ?>" name="s1" id="s1" /><br /><br />
									<select name='state'>
	<option value="">Select Category</option>
										<option value="CA">California</option>
										<option value="OH">Ohio</option>
										<option value="PA">Pennsylvania</option>
</select>
<select name='category'>
										<option value="">Select Category</option>
	<option value="">Auto</option>
	<option value="">Fun</option>
	<option value="">Links</option>
	<option value="">Wordpress</option>
									</select>

<label>City</label>							<input type="text" value="<?php echo wp_specialchars($s, 1); ?>" name="s2" id="s2" /><br /><br />

<label>Zip Code</label>
<input type="text" value="<?php echo wp_specialchars($s, 1); ?>" name="s3" id="s3" /><br /><br />
									<input type='submit' name='submit' value="Submit" class='submitBtn' >

Please help…