function navigation_radio()
{
    href = document.location.href;
    url_bits = href.split("/");
    target = url_bits[3];
    //if the target is language template folder
    if (target=="en" || target=="es")
    {
    	target = url_bits[4];
	}
    if(target=="")
    {
        target="home";   
    }
    obj =document.getElementById("nav_"+target); 
    obj.classname="navigation_radio";
    obj.style.color="black";
    obj.style.backgroundColor="white";

}

function center_on_screen(object_name)
{
    object = document.getElementById(object_name);
    //if the object exists
    if(object)
    {
        obj_width = object.offsetWidth;
        obj_height = object.offsetHeight;
        //get the screen size
        screen_width =screen.width ;
        screen_height =screen.height ;
        target_left = screen_width/2 - obj_width/2;
        target_top = screen_height/2 - obj_height/2;
        //set the object to the position
        //object.style.top = target_top+"px";
        object.style.left = target_left+"px";
    }
    
}