call code behind function from javascript

need some help to this javascript function;

function MyFunction() {
//Get values from textboxes that wiil be passed to function
var ceoname = document.getElementById('<%=lblCEOName.ClientID %>').value;
var ceoimgurl = document.getElementById('<%=lblCEOImgUrl.ClientID %>').value;
PageMethods.SetImageCEO(onSucess, onError);

function onSucess() {
$get('lblName').innerHTML =ceoname;
$get('empImg').innerHTML =ceoimgurl;
}

function onError(error) {
alert("Error: " + error.get_message());
}
}
function clr() {
$get('lblName').innerHTML =""; //clear name of employee
$get('empImg').innerHTML =""; //hide image
}

</script>

now the code behind

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
popCEO(); // this will set employee name and its pic url to variable/labels
popHead1();
popSecA();
popSecB();
popSecC();
popSecD();
}
}

[WebMethod]
void SetImageCEO()
{
lblName.Text = lblCEOName.Text;
empImg.ImageUrl = lblCEOImgUrl.Text;
}
[WebMethod]
void SetImageHead1()
{
lblName.Text = lblH1Name.Text;
empImg.ImageUrl = lblH1ImgUrl.Text;
}
[WebMethod]
void SetImageSecA()
{
lblName.Text = lblSAName.Text;
empImg.ImageUrl = lblSAImgUrl.Text;
}
[WebMethod]
void SetImageSecB()
{
lblName.Text = lblSBName.Text;
empImg.ImageUrl = lblSBImgUrl.Text;
}
[WebMethod]
void SetImageSecC()
{
lblName.Text = lblSCName.Text;
empImg.ImageUrl = lblSCImgUrl.Text;
}
[WebMethod]
void SetImageSecD()
{
lblName.Text = lblSDName.Text;
empImg.ImageUrl = lblSDImgUrl.Text;
}
void popCEO()
{
lblCEOName.Text = "CEO of Company";
lblCEOImgUrl.Text = "~/Images/CEO.jpg";
}
void popHead1()
{
lblH1Name.Text = "Head1 of Company";
lblH1ImgUrl.Text = "~/Images/Head1.jpg";
}
void popSecA()
{
lblSAName.Text = "Sec A of Company";
lblSAImgUrl.Text = "~/Images/SecA.jpg";
}
void popSecB()
{
lblSBName.Text = "Sec B of Company";
lblSBImgUrl.Text = "~/Images/SecB.jpg";
}
void popSecC()
{
lblSCName.Text = "Sec C of Company";
lblSCImgUrl.Text = "~/Images/SecC.jpg";
}
void popSecD()
{
lblSDName.Text = "Sec D of Company";
lblSDImgUrl.Text = "~/Images/SecD.jpg";
}

-------------------

i need to call these functions when i move mouse over/out to any of the link.

this will show the employee pic and its name ;

call code behind function from javascript

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