POSTDATA without buttons in HTML4?

I have graphs in an html page. The graphs are generated by a call to a cgi-bin program in an IMG tag:  &nb开发者_如何学编程sp; <IMG src="http://myserver.com/cgi-bin/StatBarChart.cgi?data=1,2,&data=3,5,1&legend=EC,ER"> Currently, the data for the graphs is passed as GET args (in the URL itself.)

Everything’s working OK, but te GET arguments are too long. I want to pass the data via POSTDATA. All the books I have (and discussions on the web that I’ve found) talk about using POSTDATA in forms that include a Submit button. I just want the graphs to appear as part of the page, without a Submit. Can this be done? Can it be done in HTML4, or does it require javascript?

I would require javascript, as you would have to get the resource yourself and set it to the img tag. This is not possible in html4.

Also, I don't see the problem with a long url. Your user will never see it (unless he looks in the sourcecode, which I don't consider as simple "user" anymore) so there is no problem with that either.