Perform while loop in the Selenium IDE.

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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head profile="http://selenium-ide.openqa.org/profiles/test-case">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link rel="selenium.base" href="http://demo.opensourcecms.com/" />
<title>whileTest</title>
</head>
<body>
<table cellpadding="1" cellspacing="1" border="1">
<thead>
<tr><td rowspan="1" colspan="3">whileTest</td></tr>
</thead><tbody>
<tr>
    <td>store</td>
    <td>10</td>
    <td>var1</td>
</tr>
<tr>
    <td>while</td>
    <td>${var1} &lt; 20</td>
    <td></td>
</tr>
<tr>
    <td>echo</td>
    <td>Value of var1 is ${var1}</td>
    <td></td>
</tr>
<tr>
    <td>storeEval</td>
    <td>new Number(storedVars['var1']) + 1</td>
    <td>var1</td>
</tr>
<tr>
    <td>endWhile</td>
    <td></td>
    <td></td>
</tr>
</tbody></table>
</body>
</html>