function swap(new_text, previous_text) {
    document.getElementById(previous_text.toString()).style.display = "none";
    document.getElementById(new_text.toString()).style.display = "block";
}

function GetWidth() {
    var x = 0;
    if (self.innerHeight) {
        x = self.innerWidth;
    } else if (document.documentElement && document.documentElement.clientHeight) {
        x = document.documentElement.clientWidth;
    } else if (document.body) {
            x = document.body.clientWidth;
    }
    return x;
}
 
function GetHeight() {
    var y = 0;
    if (self.innerHeight) {
        y = self.innerHeight;
    } else if (document.documentElement && document.documentElement.clientHeight) {
        y = document.documentElement.clientHeight;
    } else if (document.body) {
        y = document.body.clientHeight;
    }
    return y;
}