Hi, deleting in line 166 in components/com_grid/layouts/GridView.php should do it.
Before:
$field['output_script'] .= "\" ><span class=\"field\"> <b><a href=\"javascript:;\" onclick=\"searchjx('".$this->ajaxURL($column->columnName, $field['order_direction'])."', '$this->_ID');\" class=\"field\">";
After:
$field['output_script'] .= "\" ><span class=\"field\"><b><a href=\"javascript:;\" onclick=\"searchjx('".$this->ajaxURL($column->columnName, $field['order_direction'])."', '$this->_ID');\" class=\"field\">";
