function hoverimg(item){
    if(item == "nothing") {
    document.getElementById("image_wrapper_one").style.zIndex = 3;
    document.getElementById("image_wrapper_second").style.zIndex = 2;
    document.getElementById("image_wrapper_third").style.zIndex = 1;

    }
    
    if(item == "industrial") {
    document.getElementById("image_wrapper_second").style.zIndex = 3;
    document.getElementById("image_wrapper_one").style.zIndex = 2;
    document.getElementById("image_wrapper_third").style.zIndex = 1;
    
    document.getElementById("subnav_top_middle_head").style.color= '#FFFFFF';
    document.getElementById("subnav_middle_middle").className = 'subnav_middle_blue';
    document.getElementById("middle_link").className = 'active';
    document.getElementById("subnav_top_middle").className = 'subnav_top_blue';
    document.getElementById("subnav_bottom_middle").className = 'subnav_bottom_blue';

    style_reset_left();
    style_reset_right();    }

    else if(item == "broadcasting") {
    
    document.getElementById("image_wrapper_one").style.zIndex = 3;
    document.getElementById("image_wrapper_second").style.zIndex = 2;
    document.getElementById("image_wrapper_third").style.zIndex = 1;

    document.getElementById("subnav_top_left_head").style.color = '#FFFFFF';
    document.getElementById("subnav_middle_left").className = 'subnav_middle_blue';
    document.getElementById("left_link").className = 'active';
    document.getElementById("subnav_top_left").className = 'subnav_top_blue';
    document.getElementById("subnav_bottom_left").className = 'subnav_bottom_blue';

    style_reset_right();
    style_reset_middle();    }

    else if(item == "aboutus") {
    document.getElementById("image_wrapper_third").style.zIndex = 3;
    document.getElementById("image_wrapper_one").style.zIndex = 2;
    document.getElementById("image_wrapper_second").style.zIndex = 1;

    document.getElementById("subnav_top_right_head").style.color = '#FFFFFF';
    document.getElementById("subnav_middle_right").className = 'subnav_middle_blue';
    document.getElementById("right_link").className = 'active';
    document.getElementById("subnav_top_right").className = 'subnav_top_blue';
    document.getElementById("subnav_bottom_right").className = 'subnav_bottom_blue';
    style_reset_left();
    style_reset_middle();
    }
}

function style_reset_left(){
    document.getElementById("left_link").className = 'none';
    document.getElementById("subnav_middle_left").className = 'subnav_middle';
    document.getElementById("subnav_top_left_head").style.color = '#424242';
    document.getElementById("subnav_top_left").className = 'subnav_top';
    document.getElementById("subnav_bottom_left").className = 'subnav_bottom';
}

function style_reset_middle(){
    document.getElementById("middle_link").className = 'none';
    document.getElementById("subnav_middle_middle").className = 'subnav_middle';
    document.getElementById("subnav_top_middle_head").style.color = '#424242';
    document.getElementById("subnav_top_middle").className = 'subnav_top';
    document.getElementById("subnav_bottom_middle").className = 'subnav_bottom';
}

function style_reset_right(){
    document.getElementById("right_link").className = 'none';
    document.getElementById("subnav_middle_right").className = 'subnav_middle';
    document.getElementById("subnav_top_right_head").style.color = '#424242';
    document.getElementById("subnav_top_right").className = 'subnav_top';
    document.getElementById("subnav_bottom_right").className = 'subnav_bottom';
}