<script type="text/javascript" src="jquery.min.js"></script>
<script type="text/javascript">
function doSomething() {
    $.get("somepage.php");
    return false;
}
</script>

<a href="#" onclick="doSomething();">Click Me!</a>

function doSomething(id) {
    $.get("somepage.php?id="+id);
    return false;
}

function doSomething(id) {
    $.get("somepage.php", { id: id } );
    return false;
}

function doSomething(myData ) {
$.get("somepage.php" , {'data': myData } , function(result){
    });
}