var sysInfo = null;
 
window.onload = init;
 
var SMOOTH = true;
 
function init() {
    // Obtain the SystemInfo object
    try {
        sysInfo = document.embeds[0];
    } catch (ex) {
        alert("SystemInfo object cannot be found.");
        return;
    }
}
 
// Switches the display light on
function lightOn() {
    if (sysInfo == undefined) {
        alert("SystemInfo object is undefined.");
        return;
    }
 
    // Reset the backlight state to default
    resetLight();
 
    sysInfo.lighton(sysInfo.lighttargetsystem, sysInfo.lightinfiniteduration,
        sysInfo.lightmaxintensity, SMOOTH);
}
 
// Starts blinking the display 
function blink() {
    if (sysInfo == undefined) {
        alert("SystemInfo object is undefined.");
        return;
    }
 
    // Reset the backlight state to default
    resetLight();
 
    sysInfo.lightblink(sysInfo.lighttargetsystem,
        sysInfo.lightinfiniteduration, sysInfo.lightdefaultcycletime,
        sysInfo.lightdefaultcycletime, sysInfo.lightmaxintensity);
}
 
// Switches the display light off
function lightOff() {
    if (sysInfo == undefined) {
        alert("SystemInfo object is undefined.");
        return;
    }
 
    sysInfo.lightoff(sysInfo.lighttargetsystem, sysInfo.lightinfiniteduration,
        SMOOTH);
}
 
// Sets the backlight of the display to default value
function resetLight() {
    if (sysInfo == undefined) {
        alert("SystemInfo object is undefined.");
        return;
    }
 
    sysInfo.lighton(sysInfo.lighttargetsystem, sysInfo.lightinfiniteduration,
        sysInfo.lightdefaultintensity, SMOOTH);
}