function restyle(id,currentcolour) {
  if (id == 'nav_home') {
    changeColour('#901581');
  } else if (id == 'nav_environment') {
    changeColour('#15aa81');
  } else if (id == 'nav_art') {
    changeColour('#dd1581');
  } else if (id == 'nav_science') {
    changeColour('#ff9015');
  } else if (id == 'nav_software') {
    changeColour('#1030ee');
  } else if (id == 'nav_contact') {
    changeColour('#158190');
  }
}

function changeColour(colour) {
/*
    document.getElementById('nav_underline').style.backgroundColor = colour;
    document.getElementById('nav_underlinebottom').style.backgroundColor = colour;
    document.getElementById('nav_sidelineleft').style.backgroundColor = colour;
    document.getElementById('nav_sidelineright').style.backgroundColor = colour;
 //   document.body.style.backgroundColor = colour;
*/
}