if(Math.random() < 0.33333) {
	document.getElementById("tmp_header_i").style.backgroundImage = "url(/shared/style/header_i3_bgimg.jpg)";
} else if(Math.random() < 0.5) {
	document.getElementById("tmp_header_i").style.backgroundImage = "url(/shared/style/header_i2_bgimg.jpg)";
} else {
	document.getElementById("tmp_header_i").style.backgroundImage = "url(/shared/style/header_i1_bgimg.jpg)";
}