function openUserChat(){
    pWidth=463;
    pHeight=315;
    if(screen != null) {
        posX = Math.round((screen.width - pWidth) / 2);
        posY = Math.round((screen.height - pHeight) / 2);
        posCode = (document.layers)? "screenX="+posX+",screenY="+posY : "left="+posX+",top="+posY;
    }
    else posCode = "";
    window.open("http://www.my-investment.com/guest_livechat.aspx", "_blank", "width="+pWidth+",height="+pHeight+","+posCode);
}