javascript - making visible from one frame by another frame -

here im using 2 frames in frameset

1.<frame name="leftmenu" src="left.aspx" /> 2.<frame name="mainpage" src="main.aspx" /> 

in leftmenu in having treeveiw , 1 button(button name = backbut)backbut.visible=false.

in mainpage im dislpying list of search resultls(like google search results) in datalist, each result consists of href.

public datatable() { datatable dt=new datatable();  datarow row; row = dt.newrow();                                                 string hyplink = "  <a style=\"color: red;font: bold \" href=\"" + temp + "?keyword=" + key + "\">"; hyplink += "<br/><br/>" + title + "</a><br/>"; row["title"] = hyplink; dt.rows.add(row); } 

now question is, if clicked href link in mainpage frame, have make backbut.visible=true in leftmenu frame.

thanks in advance..

i believe instead of "a" tag use linkbutton , set onclick event display button

protected void linkbuttonhref_click(object sender, eventargs e) {   backbut.visible = true; }