var msgs = new Array;
msgs[0] = "images/photo1.jpg";
msgs[1] = "images/photo2.jpg";
msgs[2] = "images/photo3.jpg";
msgs[3] = "images/photo4.jpg";

function random_img(){
	var i = myrandom(msgs.length) - 1;
	document.write("<IMG SRC=\""+msgs[i]+"\" width=\"563\" height=\"254\" alt=\"SCUBA PRO SHOP\" title=\"SCUBA PRO SHOP\">"); 
}

function myrandom(max){
	var v = max * Math.random();
	if(v == 0.0){ v = 1; } else{ v = Math.ceil(v); }
	return v;
}