var nArrowStep = 0;
var nArrowTop = 140;
var nArrowGoal;
var nArrowDir = 1;
var nArrowInterval;
var aArrowSteps = [[150, 30], [140, 45], [154, 60], [-1, -1]];
var oArrowObject;

function animateArrow() {
    nArrowTop += nArrowDir;
    if ((nArrowDir > 0 && (nArrowTop >= nArrowGoal)) || (nArrowDir < 0 && nArrowTop <= nArrowGoal)) {
        nArrowTop = nArrowGoal;
        nArrowDir *= -1;
        nArrowGoal = aArrowSteps[nArrowStep][0];
        nArrowInterval = aArrowSteps[nArrowStep++][1];
    }
    oArrowObject.style.top = nArrowTop + "px";    
    if (nArrowGoal != -1) {
        setTimeout(animateArrow, nArrowInterval);
    }
}

jQuery(document).ready(function () {
    oArrowObject = document.getElementById("idHomeArrow");
    //oArrowObject.style.top = nArrowTop + "px";
    nArrowGoal = aArrowSteps[nArrowStep][0];
    nArrowInterval = aArrowSteps[nArrowStep++][1];
    setTimeout(animateArrow, 2000);
});