var position=0;

function preview_left() {
	position--;
	if(position<0)
		position+=20;
	var temp=0;
	for(var i=0;i<4;i++) {
		temp=position+i;
		if(temp>=20)
			temp-=20;
		document.getElementById('preview_'+(i+1)).src='uploads/wallpapers/thumbs/'+previews[temp]+'.jpg';
		document.getElementById('preview_'+(i+1)+'_link').href='wallpapers/view/'+previews[temp];
	}
	for(var i=1;i<=4;i++) {
		temp=position-i;
		if(temp<0)
			temp+=20;
		document.getElementById('preload_left_'+i).src='uploads/wallpapers/thumbs/'+previews[temp]+'.jpg';
	}
}

function preview_right() {
	position++;
	if(position>=20)
		position-=20;
	var temp=0;
	for(var i=0;i<4;i++) {
		temp=position+i;
		if(temp>=20)
			temp-=20;
		document.getElementById('preview_'+(i+1)).src='uploads/wallpapers/thumbs/'+previews[temp]+'.jpg';
		document.getElementById('preview_'+(i+1)+'_link').href='wallpapers/view/'+previews[temp];
	}
	for(var i=1;i<=4;i++) {
		temp=position+i;
		if(temp<0)
			temp+=20;
		document.getElementById('preload_right_'+i).src='uploads/wallpapers/thumbs/'+previews[temp]+'.jpg';
	}
}

function preview_show(num) {
	document.getElementById('screen').src='uploads/wallpapers/previews/'+previews[num]+'.jpg';
}

function preview_switch(num) {
	preview_show(num);
	document.getElementById('preview_link_'+position).className='';
	position=num;
	document.getElementById('preview_link_'+position).className='selected';
}