procedure Tform1.buttonclick();
var
i:Word;
Doc:IHtmlDocument2;
str:string;
begin
for i:=0 to WebBrowser1.OleObject.Document.Images.Length - 1 do
begin
Doc:=WebBrowser1.Document as IHtmlDocument2;
Str:=(Doc.Images.Item(i,0) as IHTMLImgElement).href;
if Pos( 'per_btn_zc.gif',str) <> 0 then
begin
((Doc.Images.Item(i,0) as IHTMLImgElement) as IHTMLElement).Click;
end;
end;
end;