Watch this example on YouTube:
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript" src="Scripts/jquery-1.10.2.js"></script>
<script type="text/javascript">
$(document).ready(function(){
jQuery.fn.exists = function () { return this.length > 0; }
if ($('#Button1').exists()) {
alert('control exists');
}
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" Text="Button" />
</div>
</form>
</body>
</html>
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