/*=====================================================================================*/
var browser_is_ie = true;

try {
    if (document.compatMode && document.all) {
        browser_is_ie = true;
    } else {
        browser_is_ie = false;
    }
} catch (error) { }

/*=====================================================================================*/


function toggle(div_id) {
    try {
        var el = document.getElementById(div_id);
        if (el.style.display == 'none') {
            el.style.display = 'block';
        } else {
            el.style.display = 'none';
        }
    } catch (error) { alert('error: ' + error); }

}

function blanket_size(popUpDivVar) {
    if (typeof window.innerWidth != 'undefined') {
        viewportheight = window.innerHeight;
    } else {
        viewportheight = document.documentElement.clientHeight;
    }
    if ((viewportheight > document.body.parentNode.scrollHeight) && (viewportheight > document.body.parentNode.clientHeight)) {
        blanket_height = viewportheight;
    } else {
        if (document.body.parentNode.clientHeight > document.body.parentNode.scrollHeight) {
            blanket_height = document.body.parentNode.clientHeight;
        } else {
            blanket_height = document.body.parentNode.scrollHeight;
        }
    }
    var blanket = document.getElementById('popup_background');
    if (browser_is_ie) {
        blanket_height = blanket_height + 900;
    }
    blanket.style.height = blanket_height + 'px';
    var popUpDiv = document.getElementById(popUpDivVar);
    //popUpDiv_height = blanket_height / 2 - 150; //150 is half popup's height
    popUpDiv_height = blanket_height / 2 - 550;
    //var popUpDiv_height = 100;
    popUpDiv.style.top = popUpDiv_height + 'px';
}

function window_pos(popUpDivVar) {
    if (typeof window.innerWidth != 'undefined') {
        viewportwidth = window.innerHeight;
    } else {
        viewportwidth = document.documentElement.clientHeight;
    }
    if ((viewportwidth > document.body.parentNode.scrollWidth) && (viewportwidth > document.body.parentNode.clientWidth)) {
        window_width = viewportwidth;
    } else {
        if (document.body.parentNode.clientWidth > document.body.parentNode.scrollWidth) {
            window_width = document.body.parentNode.clientWidth;
        } else {
            window_width = document.body.parentNode.scrollWidth;
        }
    }
    var popUpDiv = document.getElementById(popUpDivVar);
    window_width = window_width / 2 - 300; //200 is half popup's width
    popUpDiv.style.left = window_width + 'px';
}

function popup(windowname, do_toggle_blanket) {
    blanket_size(windowname);
    window_pos(windowname);
    if (do_toggle_blanket) {
        toggle('popup_background');
    }
    toggle(windowname);
}