GridView中checkbox全选/取消完美兼容IE和Firefox

function selectAll(obj)
{
var theTable = obj.parentNode.parentNode.parentNode.parentNode;
var i;
var j = obj.parentNode.cellIndex;
for(i=1;itheTable.rows.length;i++)
{
if(theTable.rows[i].cells.lengthj) continue;
var objCheckBox = theTable.rows[i].cells[j].getElementsByTagName('input')[0];
if(objCheckBox.checked!=null)objCheckBox.checked = obj.checked;
}
}

asp:TemplateField HeaderText="lt;input id='Checkbox1' type='checkbox' onclick='selectAll(this)' /gt;序号">
ItemTemplate>
input id="Checkbox1" type="checkbox" onclick="Get_jdzh(this);" title='%#Convert.ToString(Eval("cpdm")).Trim() %>' />
/ItemTemplate>
/asp:TemplateField>