var maindiv = 'slider';
var mainslide = 'sliderinner';
var itemcount = 0;
var itemclass = 'largeimage';
var itemoffclass = 'largeimageoff'
var nextb = 'nextbutton';
var backb = 'backbutton';
var nextmode = true;
var imgoff = true;
var thumbmode = true;
var thumbclassmode = true;
var thumbul = 'thumbs';
var thumbulcl = 'selected';
var defwidth = 300;
var itemar = new Array();
var currentslide = -1;
var descmode = true;
var descbackmode = true;
var descfcl = 'desc';
var descbcl = 'desc_back';
var descspan = 'desc';

function slide_init (inar) {
	if(inar.item_class != undefined){
		itemclass = inar.item_class;
	}
	if(inar.primary_div_id != undefined){
		maindiv = inar.primary_div_id;
	}
	if(inar.inner_div_id != undefined){
		mainslide = inar.inner_div_id;
	}
	if(inar.nextbutton_id != undefined){
		nextb = inar.nextbutton_id;
	} else {
		nextmode = false;
	}
	if(inar.backbutton_id != undefined){
		backb = inar.backbutton_id;
	} else {
		nextmode = false;
	}
	if(inar.item_off_class != undefined){
		itemoffclass = inar.item_off_class;
	} else {
		imgoff = false;
	}
	if(inar.thumbnail_ul_id != undefined){
		thumbul = inar.thumbnail_ul_id;
		if(inar.thumbnail_ul_sel_class != undefined){
			thumbulcl = inar.thumbnail_ul_sel_class;
		} else {
			thumbclassmode = false;
		}
	} else {
		thumbmode = false;
		thumbclassmode = false;
	}
	if(inar.description_front_id != undefined){
		descfcl = inar.description_front_id;
		descspan = inar.description_data_span_class;
		if(inar.description_back_id != undefined){
			descbcl = inar.description_back_id;
		} else {
			descbackmode = false;
		}
	} else {
		descmode = false;
		descbackmode = false;
	}
	var firstitem = '';
	$("." + itemclass).each(function () {
		if(itemcount == 0){
			defwidth = $(this).width();
			firstitem = $(this);
		} else {
			if(imgoff){
				$(this).addClass(itemoffclass);
				$(this).removeClass(itemclass);
			}
		}
		itemar[itemcount] = $(this);
		$(this).attr('itemid',itemcount);
		$(this).click(function () {
			slide_focus($(this).attr('itemid'));
		});
		itemcount++;

	});
	
	if(thumbmode){
		var thiscount = 0;
		$("#" + thumbul).find('li').each(function () {
			$(this).attr('itemid',thiscount);
			$(this).click(function () {
				slide_focus($(this).attr('itemid'));
			});
			thiscount++;
		});
	}
	if(nextmode){
		$(document).keydown(function (eve){
			if(eve.which == 37){
				slide_back();
			}
			if(eve.which == 39 || eve.which == 32){
				slide_next();
			}
		});
		$("#" + backb).click(function () {
			slide_back();
		});
		$("#" + nextb).click(function () {
			slide_next();
		});
		$("#" + maindiv).mouseenter(function () {
			$("#" + nextb).stop();
			$("#" + backb).stop();
			$("#" + nextb).animate({ 'opacity':1 });
			$("#" + backb).animate({ 'opacity':1 });
		});
		$("#" + maindiv).mouseleave(function () {
			$("#" + nextb).stop();
			$("#" + backb).stop();
			$("#" + nextb).animate({ 'opacity':.3 });
			$("#" + backb).animate({ 'opacity':.3 });
		});
		$("#" + nextb).animate({ 'opacity':.3 });
		$("#" + backb).animate({ 'opacity':.3 });
	}
	if(inar.firstslide != undefined){
		slide_focus(inar.firstslide);
	} else {
		slide_focus(0);
	}
}

function slide_next () {
	if(currentslide < (itemcount - 1)){
		slide_focus(currentslide + 1);
	}
}

function slide_back () {
	if(currentslide > 0){
		slide_focus(currentslide - 1);
	}
}

function slide_focus (itemid) {
	if(itemid != currentslide){
		var thisslide = itemar[itemid];
		$("#" + mainslide).animate({ 'left': ((($("#"+maindiv).width() / 2) - (defwidth / 2)) - (defwidth * itemid)) + 'px' });
		if(imgoff){
			$("." + itemclass).addClass(itemoffclass).removeClass(itemclass);
			$(thisslide).removeClass(itemoffclass);
			$(thisslide).addClass(itemclass);
		}
		slide_buttonupdate(itemid);
		currentslide = parseInt(itemid);
		if(thumbmode && thumbclassmode){
			$("#" + thumbul).find('li').each(function () {
				$(this).removeClass(thumbulcl);
				if(parseInt($(this).attr('itemid')) == currentslide){
					$(this).addClass(thumbulcl);
				}
			});
		}
		if(descmode){
			var pos = $(thisslide).position();
			if(descbackmode){
				$("#" + descbcl).stop();
				$("#" + descbcl).css({'opacity':0, 'left':pos.left+'px'});
				$("#" + descbcl).animate({ 'opacity':.85 },600);
			}
			$("#" + descfcl).stop();
			$("#" + descfcl).css({'opacity':0, 'left':pos.left+'px'});
			$("#" + descfcl).html($(thisslide).find('.' + descspan).html());
			$("#" + descfcl).animate({ 'opacity':1 },600);
		}
	}
}

function slide_buttonupdate (target) {
	if(nextmode){
		if(target > 0){
			$("#" + backb).show();
		} else {
			$("#" + backb).hide();
		}
		if(target < (itemcount - 1)){
			$("#" + nextb).show();
		} else {
			$("#" + nextb).hide();
		}
	}
}