function switch1(div) {
	if (document.getElementById('one')) {
	var option=['one','two','three'];
	for(var i=0; i<option.length; i++)
	{ obj=document.getElementById(option[i]);
	obj.style.display=(option[i]==div)? "block" : "none"; }
	}
	}
	//
	function switchImg(i){
	document.images["mainpic"].src = i;
}