function switchImg(what,newImg){ if (document.images){	document.images[what].src = eval(newImg + ".src");} }	
function step0(){
	switchImg('s0','s0');
	document.all.step1.style.visibility = 'hidden';
	document.all.step2.style.visibility = 'hidden';
	document.all.step3.style.visibility = 'hidden';
	document.all.step4.style.visibility = 'hidden';
	document.all.step5.style.visibility = 'hidden';
	document.all.step6.style.visibility = 'hidden';
	return true
	}

	if (document.images) {
		var s0 = new Image(); s0.src = "step0.gif";
		var s1 = new Image(); s1.src = "step1.jpg";
		var s2 = new Image(); s2.src = "step2.jpg";
		var s3 = new Image(); s3.src = "step3.jpg";
		var s4 = new Image(); s4.src = "step4.jpg";
		var s5 = new Image(); s5.src = "step5.jpg";
		var s6 = new Image(); s6.src = "step6.jpg";
	}
	
function step1(){
	switchImg('s0','s1');
	document.all.step1.style.visibility = 'visible';
	return true
	}

function step2(){
	switchImg('s0','s2');
	document.all.step2.style.visibility = 'visible';
	return true
	}

function step3(){
	switchImg('s0','s3');
	document.all.step3.style.visibility = 'visible';
	return true
	}
	
function step4(){
	switchImg('s0','s4');
	document.all.step4.style.visibility = 'visible';
	return true
	}
	
function step5(){
	switchImg('s0','s5');
	document.all.step5.style.visibility = 'visible';
	return true
	}
	
function step6(){
	switchImg('s0','s6');
	document.all.step6.style.visibility = 'visible';
	return true
	}