function changeMySrc(i) {
    if (i == 1) {
        var obj = document.getElementById("HeaderImg");
        obj.src = "images/header_1.jpg";
    }
    else if (i == 2) {
        var obj = document.getElementById("HeaderImg");
        obj.src = "images/header_2.jpg";
    }
    else if (i == 3) {
        var obj = document.getElementById("HeaderImg");
        obj.src = "images/header_3.jpg";
    }
    else if (i == 4) {
        var obj = document.getElementById("HeaderImg");
        obj.src = "images/header_4.jpg";
    }
    else if (i == 5) {
        var obj = document.getElementById("HeaderImg");
        obj.src = "images/header_5.jpg";
    }
    else if (i == 6) {
        var obj = document.getElementById("HeaderImg");
        obj.src = "images/header_6.jpg";
    }
	else if (i == 7) {
        var obj = document.getElementById("HeaderImg");
        obj.src = "images/header_7.jpg";
    }
}