function goto_tag()
	{ 
    var idt;
    idt = window.event.srcElement.id;
    if( idt != "" )
       window.open( idt, "", "fullscreen=yes,scrollbars=yes,titlebar=no,status=no,menubar=no" );
	}



  
function set_cookie(key, val)
 
	{
    document.cookie = key + "=" + val + ";";
	} 



 
function get_cookie(key)
 
    {
    var cookies, answer, stripped, rsp;
    key = key + "=";
    cookies = document.cookie;
    answer = cookies.split( key );
    if( answer.length != 2 ) return "";
    stripped = answer[ 1 ].split( ";" );
    if( stripped.length < 1 ) return "";
    rsp = stripped[ 0 ];
    return rsp;
    }


var zoom_toggle = 1;

 
function key_press( keyp )
 
    {
    window.event.returnValue = 0;
    var context;
    context = get_cookie("context");
    context = parseInt( context);
    if( keyp == 0 )
        keyp = window.event.keyCode;
    switch( keyp ) {
        case  32:   // space
        case  78:   // n
        case 110:   // N
            context_jump( context );
            break;
        case 66:   // b
        case 98:   // B
            context = -context;
            context_jump( context );
            break;
        case  77:   // m
        case 109:   // M
        case 122:   // z
        case  90:   // Z
            zoom_func( zoom_toggle + 1 );
            zoom_btn.value = ( zoom_toggle == 1 ) ? "magnify -" : "magnify +";
            zoom_toggle = ( zoom_toggle == 1 ) ? 0 : 1;
            break;

        default:
            window.close();
        }

    }



 
function clickit()

    { 
    window.event.returnValue = 0;

    var idt, h_seg, v_seg;
    idt = window.event.srcElement.id;
    if( idt == "" || idt.substring( 0, 2 ) == "xy" ) {
        h_seg = Math.floor( window.event.x * 5 / window.screen.width  );
        v_seg = Math.floor( window.event.y * 3 / window.screen.height );
	idt="handled";
        switch( h_seg ) {
            case 0:
                idt = "back"
                break;
            case 4:
            case 5:
                idt = "next"
                break;
            default: {
                if( v_seg == 0 ) {
                    idt = "zoom_btn"
                     }
                else {
                    window.close();
                    }
                }
                break;
            }
        }

    switch( idt ) {
        case "back":
            key_press( 98 );
            break;
        case "zoom_btn":
            key_press( 122 );
            break;
        case "next":
            key_press( 78 );
            break;
            idt = "";
        case "handled":
            idt = "";
            break;
        default:
            if( idt.substring( 0, 2 ) == "DDU" )
                idt = "../" + idt.subsrting( 3, 100 );
            idt =  idt + ".htm";
            navigate( idt );
        }

    }