// constructor
function Controls(element) {
    this.km = km;
    this.mi = mi;
    this.scaleNo = scaleNo;
    this.scaleYes = scaleYes;
}

// methods
function km() {
    document.getElementById('unitsCtrl').innerHTML =
    "units: <b>km<\/b> | <a onclick=\"main.makeUnitsMi()\" href=\"#\">mi<\/a>";
    document.getElementById('tableFunction').innerHTML ="P\/km<sup>2<\/sup>";
}

function mi() {
    document.getElementById('unitsCtrl').innerHTML =
    "units: <a onclick=\"main.makeUnitsKm()\" href=\"#\">km<\/a> | <b>mi<\/b>";
    document.getElementById('tableFunction').innerHTML = "P\/mi<sup>2<\/sup>";
}

function scaleYes() {
    document.getElementById('scaleCtrl').innerHTML =
    "use scale: <b>yes<\/b> | <a onclick=\"main.useScaleNo()\" href=\"#\">no<\/a>";
}

function scaleNo() {
    document.getElementById('scaleCtrl').innerHTML =
    "use scale: <a onclick=\"main.useScaleYes()\" href=\"#\">yes<\/a> | <b>no<\/b>";
}