Answers for "onclick show confirm box"

comfirm before delete

<a href="#" title="delete" class="delete" onclick="return confirm('Are you sure you want to delete this item')">Delete</a>

jquery confirmation dialog example

$("#complexConfirm").confirm({
    title:"Delete confirmation",
    text:"This is very dangerous, you shouldn't do it! Are you really really sure?",
    confirm: function(button) {
        alert("You just confirmed.");
    },
    cancel: function(button) {
        alert("You aborted the operation.");
    },
    confirmButton: "Yes I am",
    cancelButton: "No"
});