function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function photoback() {
	p1 = document.getElementById('main_photo');
	if(current>0) p1.src = pics[--current];
	else {
		p1.src = pics[last_pic];
		current = last_pic;
	}
}

function photoforward() {
	p1 = document.getElementById('main_photo');
	if(current<last_pic) p1.src = pics[++current];
	else {
		p1.src = pics[0];
		current = 0;
	}
}

function setphoto(idx) {
	p1 = document.getElementById('main_photo');
	p1.src = pics[idx];
	current = idx;
}