if u r using linkbutton or any other control then controlname.attributes.add("onclick","Javascript:OpenPopup('Give URl Name Here')"); function Openpopup(Url) { winObj=window.open(Url,"winDetails","menu=0,scrollbars=1,noresize,toolbar=0,width=380,height=360,left=10,top=10"); winObj.focus(); winobj=null; } Chintala Kiran