To have check all option (alernate method) using javascript

<_pre _lang="_jscript"><_script _language="_javascript">_function _SelectAllCheckboxes(_spanChk){ _// Added as ASPX uses SPAN for checkbox _var oItem = spanChk.children; _var _theBox= _(spanChk.type=="checkbox") ?spanChk : spanChk.children.item[0]; _xState=_theBox.checked; _elm=_theBox.form.elements; _for(_i=0;_i<_elm._length;_i++_) _type="=" checked="_xState;">

reference: http://www.codeproject.com/aspnet/SelChkboxesDataGridView.asp