//  Replace the currently shown layer

var current_layer = null;

function replace_layer(replacement_layer)

{

    if (!current_layer) return;

    if (!replacement_layer) return;



    current_layer.setVisibility('hidden');

    replacement_layer.setVisibility('visible');

    current_layer = replacement_layer;

}





// Hide / show sets of layers

var layer_array = new Array();

var temp = null;



// Show this layer

function set_layer(new_layer)

{

    layer_array[layer_array.length] = new_layer;

    new_layer.setVisibility('visible');

}



// Clear all the layers that were set

function clear_layers()

{

    var i;

    for (i = 0; i < layer_array.length; i++)

	{

	    layer_array[i].setVisibility('hidden');

	}

    layer_array.length = 0;

}





//  Dummy functions for unsupported operations

function do_nothing(name, right, bottom)

{

    ;

}





/*

 * This function parses comma-separated name=value argument pairs from

 * the query string of the URL. It stores the name=value pairs in 

 * properties of an object and returns that object.

 */

function getArgs(separator) {

    var args = new Object();

    var query = location.search.substring(1);  // Get query string.

    var pairs = query.split(separator);              // Break at separator.

    for(var i = 0; i < pairs.length; i++) {

	var pos = pairs[i].indexOf('=');       // Look for "name=value".

	if (pos == -1) continue;               // If not found, skip.

	var argname = pairs[i].substring(0,pos);  // Extract the name.

	var value = pairs[i].substring(pos+1); // Extract the value.

	args[argname] = unescape(value);          // Store as a property.

    }

    return args;                               // Return the object.

}





/*

 * These functions write email links that don't sniff well...

 */

function esrever(ni)

{

    var tuo = new String();

    for (i=0; i < ni.length; i++) {

	tuo = ni.charAt(i) + tuo;

    }

    return tuo;

}

      

function rul(resu, mod)

{

    var temp = new String("moc.");

    return esrever(temp.concat(mod, "@", resu));

}



function writeUs (resu, sep, mod, com)

{

    document.write(esrever(":otliam'=ferh A<"));

    document.write(rul(resu, mod));

    document.write(esrever(">'"));

    document.write(rul(resu, mod));

    document.write(esrever(">A/<"));

}



function mailOpen(resu, sep, mod, com)

{

    document.write(esrever(":otliam'=ferh A<"));

    document.write(rul(resu, mod));

    document.write(esrever(">'"));

}



function mailClose()

{

    document.write(esrever(">A/<"));

}



function anchorOpen(url, etc)

{

    document.write("<a href=");

    document.write(url);

    document.write(" ");

    document.write(etc);

    document.write(">");

}





function anchorClosed(url, etc)

{

    document.write("</a>");

}





// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

// Older stuff here...



// Determine the version

nav_version = 2;

if (((navigator.appName == "Netscape")

     && (parseInt(navigator.appVersion) >= 3))

    || ((navigator.appName == "Microsoft Internet Explorer")

	&& (parseInt(navigator.appVersion) >= 4)))

{

    nav_version = 3;

}

if (((navigator.appName == "Netscape")

     && (parseInt(navigator.appVersion) >= 4))

    || ((navigator.appName == "Microsoft Internet Explorer")

	&& (parseInt(navigator.appVersion) >= 4)))

{

    nav_version = 4;

}





// Turn on the image highlight

function rollover_on(img)

{

    if (nav_version >= 3) 

	{

	    img.src = this.highlight.src;

	}

}





// Turn off the image highlight

function rollover_off(img)

{

    if (nav_version >= 3) 

	{

	    img.src = this.normal.src;

	}

}





// Constructor for a rollover

function Rollover(normal, highlight)

{

    if (nav_version >= 3) 

	{

	    this.normal = new Image();

	    this.normal.src = normal;

	    this.highlight = new Image();

	    this.highlight.src = highlight;

	}

    this.on = rollover_on;

    this.off = rollover_off;

}





//  Turn on the follower

function follower_on(index) 

{

    if (nav_version >= 3) 

	{

	    //  Move the current graphic to the last spot

	    this.files[this.last] = this.files[index];

	    this.images[this.last].src = this.files[index];

      

	    //  Replace the current with the new one

	    this.files[index] = this.normal;

	    this.images[index].src = this.highlight;

      

	    //  Remember where it is

	    this.last = index;

	}

}





//  Turn off the follower

function follower_off(index)

{

    if (nav_version >= 3) 

	{

	    this.images[index].src = this.normal;

	}

}





//  Add a new element to the followers array

function follower_add(index, image, file)

{

    this.images[index] = image;

    this.files[index] = file;        

}

 



//  Create the followers array

function Followers(index, normal, highlight)

{

    this.last = index;



    this.normal = normal;

    this.highlight = highlight;



    this.images = new Array();

    this.files = new Array();

        

    this.on = follower_on;

    this.off = follower_off;

    this.add = follower_add;

}





//  Add a new element to the counters array

function counter_add(index, image)

{

    this.images[index] = image;

}





//  Set the new value for the counter

function counter_set(value)

{

    var i;

    for (i = 0; i < this.last; i++)

	{

	    this.images[i].src = this.files[Math.floor(value)%10];

	    value = Number(value)/10;

	}

} 





//  Create the counter array

function Counter(index, f0, f1, f2, f3, f4, f5, f6, f7, f8, f9)

{

    this.last = index;



    this.images = new Array();

    this.files = new Array();



    this.files[0] = f0;

    this.files[1] = f1;

    this.files[2] = f2;

    this.files[3] = f3;

    this.files[4] = f4;

    this.files[5] = f5;

    this.files[6] = f6;

    this.files[7] = f7;

    this.files[8] = f8;

    this.files[9] = f9;



    this.add = counter_add;

    this.set = counter_set;

}





// Count down seconds in the status line

var time_left = 0;

var status_message = "";

function count_down(message, seconds)

{

    time_left = seconds;

    status_message = message;

    do_count_down();

}



function do_count_down()

{

    defaultStatus = status_message + time_left;

    time_left--;



    if (time_left > 0)

	{

	    setTimeout("do_count_down()", 1000);

	}

}





// Time the loading so we know when to change pages

var load_time;

function start_timer()

{

    load_time = 0;

    setTimeout("tic_time()", 1000);

}

function tic_time()

{

    load_time++;

    setTimeout("tic_time()", 1000);

}



// Constructor for the Preload

function Preload(pic)

{

    if (nav_version >= 3) 

	{

	    this.pic = new Image();

	    this.pic.src = pic;

	}

}



// Change to the next page

function next_page(end_time, url)

{

    if (end_time <= load_time)

	{

	    self.location.href = url;

	}

    else

	{

	    setTimeout("next_page("+end_time+", '"+url+"')",

		       1000 * (end_time - load_time));

	}

}