[devote]

когда вы научитесь не помойку писать, а нормально отформатированный код:

window.onload = function () {
    onLoad()
};
onLoad = function () {
    initLegend();
    initCalculator();
    initDiscCalculator();
}
initLegend = function () {
    if (document.getElementById && document.getElementById('shemeLegend')) {
        oSheme = {
            'nLegend': document.getElementById('shemeLegend'),
            'aLabels': new Array()
        }
        initLegendLabel('L');
        initLegendLabel('H');
        initLegendLabel('D');
        initLegendLabel('DD');
    }
}
initLegendLabel = function (sLabel) {
    if (oSheme && document.getElementById && document.getElementById('labelSheme' + sLabel)) {
        document.getElementById('labelSheme' + sLabel).onmouseover = function () {
            legendMouseOver(sLabel);
        };
        document.getElementById('labelSheme' + sLabel).onmouseout = function () {
            legendMouseOut();
        };
        oSheme.aLabels.push(sLabel);
        if (document.getElementById('sheme' + sLabel)) {
            doPreload(document.getElementById('sheme' + sLabel).src);
        }
    }
}
legendMouseOver = function (sLabel) {
    legendMouseOut();
    addClass(oSheme.nLegend, 'label' + sLabel);
}
legendMouseOut = function () {
    for (i in oSheme.aLabels) {
        removeClass(oSheme.nLegend, 'label' + oSheme.aLabels[i]);
    }
}
initCalculator = function () {
    oCalculator = {
        'oldWidth': document.getElementById('oldWidth'),
        'oldDiameter': document.getElementById('oldDiameter'),
        'oldProfile': document.getElementById('oldProfile'),
        'newWidth': document.getElementById('newWidth'),
        'newDiameter': document.getElementById('newDiameter'),
        'newProfile': document.getElementById('newProfile'),
        'oldL': document.getElementById('oldL'),
        'newL': document.getElementById('newL'),
        'deltaL': document.getElementById('deltaL'),
        'oldH': document.getElementById('oldH'),
        'newH': document.getElementById('newH'),
        'deltaH': document.getElementById('deltaH'),
        'oldD': document.getElementById('oldD'),
        'newD': document.getElementById('newD'),
        'deltaD': document.getElementById('deltaD'),
        'oldDD': document.getElementById('oldDD'),
        'newDD': document.getElementById('newDD'),
        'deltaDD': document.getElementById('deltaDD')
    }
    oSpeedometer = new Array();
    var i = 10;
    while (document.getElementById('speed' + i)) {
        oSpeedometer[i] = document.getElementById('speed' + i);
        i += 10;
    }
    applyCalculateEvent(oCalculator.oldWidth);
    applyCalculateEvent(oCalculator.oldDiameter);
    applyCalculateEvent(oCalculator.oldProfile);
    applyCalculateEvent(oCalculator.newWidth);
    applyCalculateEvent(oCalculator.newDiameter);
    applyCalculateEvent(oCalculator.newProfile);
    doCalculate();
}
applyCalculateEvent = function (nNode) {
    nNode.onchange = function () {
        doCalculate();
    };
}
doCalculate = function () {
    var iOldL = oCalculator.oldWidth.value;
    var iNewL = oCalculator.newWidth.value;
    var iOldD = Math.round(oCalculator.oldDiameter.value * 25.4);
    var iNewD = Math.round(oCalculator.newDiameter.value * 25.4);
    var iOldDD = Math.round(oCalculator.oldWidth.value * oCalculator.oldProfile.value * 0.02 + oCalculator.oldDiameter.value * 25.4);
    var iNewDD = Math.round(oCalculator.newWidth.value * oCalculator.newProfile.value * 0.02 + oCalculator.newDiameter.value * 25.4);
    var iOldH = Math.round((iOldDD - iOldD) / 2);
    var iNewH = Math.round((iNewDD - iNewD) / 2);
    var iSpeedCoeff = iNewDD / iOldDD;
    setTextValue(oCalculator.oldL, iOldL);
    setTextValue(oCalculator.newL, iNewL);
    setTextValue(oCalculator.deltaL, iNewL - iOldL);
    setTextValue(oCalculator.oldH, iOldH);
    setTextValue(oCalculator.newH, iNewH);
    setTextValue(oCalculator.deltaH, iNewH - iOldH);
    setTextValue(oCalculator.oldD, iOldD);
    setTextValue(oCalculator.newD, iNewD);
    setTextValue(oCalculator.deltaD, iNewD - iOldD);
    setTextValue(oCalculator.oldDD, iOldDD);
    setTextValue(oCalculator.newDD, iNewDD);
    setTextValue(oCalculator.deltaDD, iNewDD - iOldDD);
    for (i in oSpeedometer) {
        setTextValue(oSpeedometer[i], Math.round(i * iSpeedCoeff * 10) / 10);
    }
}
initDiscCalculator = function () {
    if (document.getElementById && document.getElementById('tireWidth') && document.getElementById('tireDiameter') && document.getElementById('tireProfile') && document.getElementById('discDiameter') && document.getElementById('discWidthMin') && document.getElementById('discWidthMax')) {
        oDiscCalculator = {
            'tireWidth': document.getElementById('tireWidth'),
            'tireDiameter': document.getElementById('tireDiameter'),
            'tireProfile': document.getElementById('tireProfile'),
            'discDiameter': document.getElementById('discDiameter'),
            'discWidthMin': document.getElementById('discWidthMin'),
            'discWidthMax': document.getElementById('discWidthMax')
        }
        applyCalculateDiscEvent(oDiscCalculator.tireWidth);
        applyCalculateDiscEvent(oDiscCalculator.tireDiameter);
        applyCalculateDiscEvent(oDiscCalculator.tireProfile);
        doCalculateDisc();
    }
}
applyCalculateDiscEvent = function (nNode) {
    nNode.onchange = function () {
        doCalculateDisc();
    };
}
doCalculateDisc = function () {
    if (oDiscCalculator) {
        var iWidth = oDiscCalculator.tireWidth.value;
        var iProfile = oDiscCalculator.tireProfile.value;
        var iDiameter = oDiscCalculator.tireDiameter.value;
        iWidthMin = (Math.round(((iWidth * ((iProfile < 50) ? 0.85 : 0.7)) * 0.03937) * 2)) / 2;
        iWidthMax = (iWidthMin + 1.5);
        setTextValue(oDiscCalculator.discDiameter, iDiameter);
        setTextValue(oDiscCalculator.discWidthMin, iWidthMin);
        setTextValue(oDiscCalculator.discWidthMax, iWidthMax);
    }
}
setTextValue = function (nNode, sValue) {
    sValue = String(sValue);
    sValue = sValue.replace(/\./, ',');
    nNode.innerHTML = sValue;
}
isClass = function (nNode, sClassName) {
    return (nNode.className.indexOf(sClassName) >= 0);
}

addClass = function (nNode, sClassName) {
    if (nNode.className) {
        var aClass = nNode.className.split(' ');
        for (var i in aClass) {
            if (sClassName == aClass[i]) {
                sClassName = '';
            }
        }
        if (sClassName) {
            aClass.push(sClassName);
        }
        nNode.className = aClass.join(' ');
    } else {
        nNode.className = sClassName;
    }
}
removeClass = function (nNode, sClassName) {
    if (nNode.className) {
        var aClass = nNode.className.split(' ');
        for (var i in aClass) {
            if (sClassName == aClass[i]) {
                aClass.splice(i, 1);
                break;
            }
        }
        nNode.className = aClass.join(' ');
    }
}
doPreload = function (sImg) {
    var oPreload = new Image();
    oPreload.src = sImg;
}