i am trying to add Element to existing html content using prototype insert. below is the html on which i am working
<table id="productGrid_table" class="data" cellspacing="0">
<thead>
<tr class="filter">
<th>
<div class="range">
</div>
</th>
</tr>
</thead>
here i want to add another < th> in < tr class="filter">, i am trying to achieve this using below prototype code
$('filter').insert("<th><div class='field-100'></div></th>");
please provide some suggestion what i am doing wrong here???