Javascript to get the id of the hyperlink clicked

I would like to know how i can set the current hyperlink id to a hidden field on clicking the corresponding links. The html control code is as follows:

<a href="#TB_inline?height=155&width=300&inlineId=hiddenModalContent" class="thickbox" id="ExpressionsLink"
          title="Create expression column" onclick="keepID()">Add Expressions Model</a> 
           <a href开发者_开发技巧="#TB_inline?height=155&width=300&inlineId=hiddenModalContent" class="thickbox" id="AggregateMethodLink"
          title="Create aggregate column">Add Aggregate Methods</a><input id="HiddenIdHolder" 
          type="hidden" />

I need the id of the link clicked on the hidden field 'HiddenIdHolder'.

Javascript

 function keepID() {
     var hiddenInput = document.getElementById("HiddenIdHolder");
     hiddeninput.value= ? // What can i do here to get the id?
 }

this refers to the element itself. Example on jsFiddle

onclick="keepID(this)"

Then

function keepID(element)
{
    var hiddenInput = document.getElementById("HiddenIdHolder");
    hiddeninput.value = element.getAttribute("id");
}

Use jQuery:

$('a').click(function() {
    $('#HiddenIdHolder').val($(this).attr('id'))
})

You should modify your HTML to provide argument for KeepID function:

<a href="#xxx" onclick="KeepID(this);">ooxx</a>

note that you should provide a this argument when invoke KeepID function, then in KeepID function, you can access this element from argument:

function KeepID(src) {
    document.getElementById("HiddenIdHolder").value = src.id;
}