if(location.pathname == "/surf.aspx"){
    document.getElementById('surf').style.backgroundPosition="0px -75px";
}
if(location.pathname == "/skate.aspx"){
    document.getElementById('skate').style.backgroundPosition="0px -75px";
}
if(location.pathname == "/snow.aspx"){
    document.getElementById('snow').style.backgroundPosition="0px -75px";
}
if(location.pathname == "/wake.aspx"){
    document.getElementById('wake').style.backgroundPosition="0px -75px";
}
if(location.pathname == "/kite.aspx"){
    document.getElementById('kite').style.backgroundPosition="0px -75px";
}
if(location.pathname == "/wind.aspx"){
    document.getElementById('wind').style.backgroundPosition="0px -75px";
}