jQuery.fn.yourfunctionname = function(idName) {
$('.ISInnerContainer').children('.images').children().stop().animate({ "top": '210px' }, 2);
$('.ISInnerContainer').children('.images').children('.' + idName).stop().animate({ "top": '0px' }, 2);
};

$(function() {
    $('.image').hover(function() {
        var currentId = $(this).attr("id");
        var mySplitResult = currentId.split("_");
        $('.Thumbs').yourfunctionname(mySplitResult[0]);
    }, function() { //do nothing - keep as it is.
    });
});