function initBackground() {
    aSizes = getSizes();
    document.getElementById('container').style.height = aSizes[1]+'px';
}

function getScroll(){
    if (self.pageYOffset) {
        yScroll = self.pageYOffset;
    } else if (document.documentElement && document.documentElement.scrollTop) { // Explorer 6 Strict
        yScroll = document.documentElement.scrollTop;
    } else if (document.body) { // all other Explorers
        yScroll = document.body.scrollTop;
    }

    aScroll = new Array('',yScroll)
    return aScroll;
}

function getSizes() {
    if (window.innerHeight && window.scrollMaxY) {
        xScroll = document.body.scrollWidth;
        yScroll = window.innerHeight + window.scrollMaxY;
    } else if (document.body.scrollHeight > document.body.offsetHeight) { // all but Explorer Mac
        xScroll = document.body.scrollWidth;
        yScroll = document.body.scrollHeight;
    } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
        xScroll = document.body.offsetWidth;
        yScroll = document.body.offsetHeight;
    }

    var windowWidth, windowHeight;
    if (self.innerHeight) { // all except Explorer
        windowWidth = self.innerWidth;
        windowHeight = self.innerHeight;
    } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
        windowWidth = document.documentElement.clientWidth;
        windowHeight = document.documentElement.clientHeight;
    } else if (document.body) { // other Explorers
        windowWidth = document.body.clientWidth;
        windowHeight = document.body.clientHeight;
    }

    // for small pages with total height less then height of the viewport
    if (yScroll < windowHeight){
        pageHeight = windowHeight;
    } else {
        pageHeight = yScroll;
    }

    // for small pages with total width less then width of the viewport
    if (xScroll < windowWidth){
        pageWidth = windowWidth;
    } else {
        pageWidth = xScroll;
    }

    aSizes = new Array(pageWidth,pageHeight,windowWidth,windowHeight);
    return aSizes;
}

function showPopup(sName,sType,iWidth,iHeight,sContent) {
    aSizes  = getSizes();
    aScroll = getScroll();

    document.getElementById('overlay-'+sName).style.height = aSizes[1]+'px';
    document.getElementById('overlay-'+sName+'-bg').style.height = aSizes[1]+'px';

    iContentTop = aScroll[1] + ((aSizes[3] - (iHeight+40)) / 2);
    iContentLeft = (aSizes[0] - (iWidth+40)) / 2;

    document.getElementById('overlay-'+sName+'-close').style.top  = (iContentTop-0)+'px';
    document.getElementById('overlay-'+sName+'-close').style.left = (iContentLeft+iWidth+20+0)+'px';

    document.getElementById('overlay-'+sName+'-content').style.width = iWidth+'px';
    document.getElementById('overlay-'+sName+'-content').style.height = iHeight+'px';
    document.getElementById('overlay-'+sName+'-content').style.top = iContentTop+'px';
    document.getElementById('overlay-'+sName+'-content').style.left = iContentLeft+'px';

    if (sType == 'text') {
        if (sContent) {
            if (sContent.indexOf('success') != -1) {
                document.getElementById('overlay-'+sName+'-content').style.borderColor = '#009900';
            } else if (sContent.indexOf('error') != -1) {
                document.getElementById('overlay-'+sName+'-content').style.borderColor = '#ff3333';
            }
            document.getElementById('overlay-'+sName+'-text').innerHTML = sContent;
        }
    } else if (sType == 'video' || sType == 'sound') {
        eval('so_'+sName).write('overlay-'+sName+'-'+sType);
    } else if (sType == 'image') {
        document.getElementById('overlay-'+sName+'-content').innerHTML = '<img src="'+sContent+'" alt="" />';
    }

    document.getElementById('overlay-'+sName).style.visibility = 'visible';
}

function hidePopup(sName,sType) {
    if (sType == 'video' || sType == 'sound') {
        document.getElementById('overlay-'+sName+'-'+sType).innerHTML = '';
    } else if (sType == 'image') {
        document.getElementById('overlay-'+sName+'-content').innerHTML = '';
    }
    document.getElementById('overlay-'+sName).style.visibility = 'hidden';
}