To get around the server-side-id vs client-side-id differences you can often use id selectors like this $("DIV[id$=myServerSideID]") but there is always the possibility of confusion between elements whose IDs end with the same pattern of letters.
For an internal project we've used a couple of quick and dirty custom selectors called :aspid() and :aspname() The :aspid() selector suffers from the same issues as the "$id=..." solution above. The :aspname() selector will not get confused between elements but it only works on form elements because they have a name attribute. They rely on the way asp.net build client IDs and Names that end with the server-side id... I would not recommend widespread use of these selectors because they are so asp-specific but they can be helpful none the less. Cheer. I hope this helps a wee bit. jQuery.extend(jQuery.expr[':'], { /** * Custom selector for matching elements by their server-side ID (using their client-side IDs generated by ASP.Net) * They may return multiple elements when more than one client-side id ends with the same id string. * * (Note: The :aspid() selector matches on the element id. The :aspname() selector matches on the element name (so it only works on form elements that support the name attribute). The latter is more accurate because it can rely on the "$" separator in the name attribute to correctly locate the start of the id in the string) * * @param String id The ID to search for. This is the id you used in the ASP server-side code. * * @example $("INPUT:aspid(buttonEdit)") * @desc Find the input element who's server-side id is "buttonEdit". (The client-side id will be something like ctl00_MainContent_buttonEdit) * * @name :aspid, :aspname * @type jQuery object * * @cat jQuery/Custom selector * @author George Adamson */ "aspid" : function(a,i,m){ var id=a.getAttribute("id"); return id && m[3] && id.substr(id.length - m[3].length - 1) == "_"+m[3]; }, "aspname" : function(a,i,m){ var id=a.getAttribute("name"); return id && m[3] && id.substr(id.length - m[3].length - 1) == "$"+m[3]; } });