function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		pic01 = newImage("/images/pic1.jpg");
		pic02 = newImage("/images/pic2.jpg");
		pic03 = newImage("/images/pic3.jpg");
		pic04 = newImage("/images/pic4.jpg");
		pic05 = newImage("/images/pic5.jpg");
		pic06 = newImage("/images/pic6.jpg");
		pic07 = newImage("/images/pic7.jpg");
		preloadFlag = true;
	}
}

preloadImages();

function getrandom() { 

    var min_random = 1; 
    var max_random = 7; 

    max_random++; 

    var range = max_random - min_random; 
    var n=Math.floor(Math.random()*range) + min_random; 

    return n; 
}

function imFlash(oldtmp) {
tmp = getrandom();
document.all['pc'+tmp].src = '/images/pic'+tmp+'.jpg';
document.all['pc'+oldtmp].src = '/images/pic'+oldtmp+'b.jpg';
setTimeout("imFlash(tmp)",7000);
}