/**
 * Random Background Image Generator
 *
 * This script contains a function with several global switches 
 * which will randomly assign an image from a given array of images
 * and set it as a document's background image.
 * 
 * Advanced functionality is only available in DOM compliant browsers:
 * IE 4.x up and NN6.x up
 */

//----------------------------------------------------------------------------
// CONSTANTS
//constants for background positioning
var TOPLEFT = "top left"; var TOPCENTER = "top center"; var TOPRIGHT = "top right"; var CENTERLEFT = "center left";
var CENTERCENTER = "center center"; var CENTERRIGHT = "center right"; var BOTTOMLEFT = "bottom left";
var BOTTOMCENTER = "bottom center"; var BOTTOMRIGHT = "bottom right";

//----------------------------------------------------------------------------
// GLOBAL FUNCTION SWITCHES
// sets whether or not the background image will tile, must be pulled from one of these options
// ( repeat | no-repeat | repeat-x | repeat-y )
var IMG_REPEAT = "repeat";    

// sets the position of the image if it isn't tiled, value must be pulled from one of these options
// ( TOPLEFT | TOPCENTER | TOPRIGHT | CENTERLEFT | CENTERCENTER | CENTERRIGHT | BOTTOMLEFT | BOTTOMCENTER | BOTTOMRIGHT )
var IMG_POSITION = CENTERCENTER;

// super easy browser detection for nn4.x
var NN4 = (document.layers)? true : false;

//GLOBAL IMAGE LIST
var IMG_LIST = new Array();


/**
 * to add or remove images from the list, simply add to this array structure
 * just make sure if you remove an image that you don't skip numbers or things
 * can look bad.
 */

/**
IMG_LIST[0] = "images/boomie_bg.jpg";
IMG_LIST[1] = "images/bottle_bg.jpg";
IMG_LIST[2] = "images/catghost_bg.jpg";
IMG_LIST[3] = "images/coastcar_bg.jpg";
IMG_LIST[4] = "images/eye_big_detail.jpg";
IMG_LIST[5] = "images/gulls_bg.jpg";
IMG_LIST[6] = "images/gulltail_bg.jpg";
IMG_LIST[7] = "images/hohenzollern_bg.jpg";
IMG_LIST[8] = "images/hon_ghost_big.jpg";
IMG_LIST[9] = "images/meberlin_bg.jpg";
IMG_LIST[10] = "images/sap_wall_bg.jpg";
IMG_LIST[11] = "images/spider_bg.jpg";
*/

for(i = 1; i<=48; i++)
{

	if(i < 10) 
	{
		var num_string = "0" + i.toString();
	} else {
		var num_string = i.toString();
	}

	IMG_LIST[i-1] = "images/bg_images - " + num_string + ".jpg";
}

/**
 * This function uses a global array of images and randomly selects an item from
 * that array to set as the document's background image.
 *
 * @declare public
 * @param variable type description
 * @return boolean returns true if successful, false if not.
 */
var iRnd = Math.floor(Math.random() * (IMG_LIST.length));
document.writeln("<font size=-2 color=#AAAAAA>B: " + iRnd.toString() + "</font> <br>");
        
function rndBkgndImg( ){
    // create our random number here

    // switch on the browser case
    if (!NN4){
        document.body.style.backgroundImage = "url('" + IMG_LIST[iRnd] + "')";
        document.body.style.backgroundRepeat = IMG_REPEAT;
        document.body.style.backgroundPosition = IMG_POSITION.toString();
    }
}