<!DOCTYPE html>
<html>
<head>
</head>
<body>
<table id="table-id" style="border:1px solid green">
<tr><td>abc</td><td>def</td></tr>
<tr><td>ghi</td><td>jkl</td></tr>
</table>
<script>
function change_table_border()
{
document.getElementById("table-id").style.border = "4px solid red";
}
/*
run:
on button click table border will change to "4px solid red"
*/
</script>
<button onclick="change_table_border()">change table border</button>
</body>
</html>