How to post a into a phtml page with WebBrowser?

Hi i shoul post into a phtml page (index.pthml) a image, how can i automatically post it with a WebBrowser control?

the phtm is this
<FORM action=index.phtml method=post><INPUT type=image
alt="" src="TELE2Internet E-cards_file/flyingtree.gif"
border=0 name=EcardImgId_592e4641><IMG height=96
src="TELE2Internet E-cards_file/t.gif" width=5 border=0>


help me please!!!!!!!!!!!!!!!

i use this to send a ecard which is a gif image

PS: clikking into the tree image i shoul post tha data to the phtml page and go to another webpage

Thank you very much