POST data in web forms using OmniWeb

I can’t figure out the syntax for using the OpenURL command with FormData in Omniweb. Here’s what I tried on a local Austin website to pre-populate the web page with my phone number in the HTML form:


tell application "OmniWeb"
	--activate
	OpenURL "http://www.oakhillgazette.com/default.asp?sourceid=&smenu=77&twindow=Form&mad=No&sdetail=&wpage=&skeyword=&sidate=&ccat=&ccatm=&restate=&restatus=&reoption=&retype=&repmin=&repmax=&rebed=&rebath=&subname=&pform=Community_Event&sc=1846&hn=oakhillgazette&he=.net" FormData ("Phone=441-8988")
end tell

and the result I get back from Applescript says “OmniWeb got an error: POST data or MIME-type is missing or unparseable.” Any suggestions?