function image1() {
number = 3;
increment = Math.floor(Math.random() * number);
photo = "imgs/backgrounds/bg" + increment + ".jpg";
//document.getElementById("main_table").background = photo; //NO FIREFOX


/*switch(screen.width)
{
case 800: {
		photo = photo + "_800_600.jpg";
		break;
	}
case 1024: {
		photo = photo + "_1024_768.jpg";
		break;
	}	
case 1280: {
		if (screen.width == 800) {
			photo = photo + "_1280_800.jpg";
		}
		else {
			photo = photo + "_1280_1024.jpg";
		}
		break;
	}
}*/


/*
800 x 600
1024 x 768
1280 x 800
1280 x 1024
*/

//alert(photo);

document.body.style.backgroundRepeat = "no-repeat";
//document.body.style.backgroundPosition = "center";
document.body.style.backgroundImage = "url('" +  photo + "')";
};