You can use the example from this site [login to view URL]
Im concerned with only fields = listing price min & max, leasing price min and max, bedrooms, bathrooms, square feet max and min, subdivision, zipcode, yearbuilt, and sort by.
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for_sale=1&
listing_price_min=&
listing_price_max=&
lease_price_min=&
lease_price_max=&
bedroom_num=&
full_bath_num=&
garage_num=&
garage_desc=&
stories=&
squre_feet_min=&
squre_feet_max=&
subdivision=&
subdivision2=&
subdivision3=&
zip_code=77056&
school_dist_id=&
new_constr=&
year_built=&
sort=LISTING%5FPRICE%20DESC&rowcnt=5&address=&mlnum=&keymap=&keymap2=&keymap3=&themecolor=29048C&x=24&y=11&newsearch=1&offset=1
this form will need to refresh the page with this code in a iframe.