img_despre_noi = new Image();
img_despre_noi.src = "Images/anim-1.gif";
img_produse = new Image();
img_produse.src = "Images/anim-2.gif";
img_oferta_instruire = new Image();
img_oferta_instruire.src = "Images/anim-3.gif";
img_servicii_inginerie = new Image();
img_servicii_inginerie.src = "Images/anim-4.gif";
img_legaturi = new Image();
img_legaturi.src = "Images/anim-5.gif";
img_contact = new Image();
img_contact.src = "Images/anim-6.gif";

function changePic(id, newImgSrc)
{
    document.getElementById(id).src = newImgSrc;
}

function toggleVisibility(objId, defDisplay, defHeight) {
    if(document.getElementById(objId).style.visibility == 'hidden' || document.getElementById(objId).style.visibility == '') {
        document.getElementById(objId).style.visibility = 'visible';
        document.getElementById(objId).style.height = defHeight;
        document.getElementById(objId).style.display = defDisplay;
    }
    else {
        document.getElementById(objId).style.visibility = 'hidden';
        document.getElementById(objId).style.height = '0px';
        document.getElementById(objId).style.display = 'none';
    }
}

function toggleCourses() {
    if(document.getElementById("imgShowCourses").src.indexOf("plus") != -1) {
        document.getElementById("imgShowCourses").src = "Images/minus.png";
        
    }
    else {
        document.getElementById("imgShowCourses").src = "Images/plus.png";
    }
    toggleVisibility('hiddenCourses', 'block', 'auto');
}