Finds the element with the id "myID.entry[1]".
<html> <head> <script type="text/javascript" src="js/jquery-1.3.2.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("#myID\\.entry\\[1\\]").css("border","3px solid red"); }); </script> </head> <body> <body> <div id="myID.entry[0]">id="myID.entry[0]"</div> <div id="myID.entry[1]">id="myID.entry[1]"</div> <div id="myID.entry[2]">id="myID.entry[2]"</div> </body> </html>