function findEl(id)
{
	return MM_findObj(id);
}

function MM_findObj(n, d) { //v4.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
	d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

function catalog_change()
{
	var el;
	var erase_flag = 0;
	var arr = new Array();
	var options = new Array();
	var options_flag = 0;
	var selected = new Array();

	// Check first for any stand-alone products
	var add_arrays = '';
	for(i=0; i<add_fields.length; i++)
	{
		eval("el = document.tform." + add_fields[i]);
		for (var j = 0; j < el.options.length; j++)
		{
			if (el.options[j].selected)
			{
				if (add_arrays != '')
					add_arrays += ", ";
				add_arrays += add_fields[i]+"["+j+"]";
			}
		}
	}

	if (add_arrays != '')
	{
		erase_flag = 1;
		eval("selected = arr.concat("+add_arrays+")");
	}

	// Determine selected options, or erase if necessary
	for(i=0; i<normal_fields.length; i++)
	{
		var arrays = '';
		eval("el = document.tform." + normal_fields[i]);
		for (var j = 0; j < el.options.length; j++)
		{
			if (erase_flag == 1)
				el.options[j].selected = false;
			else if (el.options[j].selected)
			{
				if (arrays != '')
					arrays += ", ";
				arrays += normal_fields[i]+"["+j+"]";
			}
		}

		if (arrays != '')
		{
			options_flag = 1;
			eval("var theseoptions = arr.concat("+arrays+")");
			theseoptions.sort(numsort);
			if (options.length == 0)
				options = theseoptions;
			else
				options = array_union(options, theseoptions);
		}
	}

	if (erase_flag == 1)
	{
		el = document.tform.products;
		for (var j = 0; j < el.options.length; j++)
			el.options[j].selected = false;
		showproducts(selected);
		return;
	}

	// Merge selected products with selected options
	selected = new Array();
	arrays = '';
	count = 0;
	el = document.tform.products;
	for (var j = 0; j < el.options.length; j++)
	{
		if (el.options[j].selected)
		{
			selected[count] = products[j];
			count++;
		}
	}

	// No products selected, so grab them all
	if (selected.length == 0)
	{
		for(i=0; i<products.length; i++)
			selected[i] = products[i];
	}

	for (i=0; i<selected.length; i++)
	{
		if (i > 0)
			arrays += ", ";
		arrays += "selected[" + i + "]";

		if (options.length == 0)
		{
			if (options_flag != 0)
				selected[i] = new Array();
		}
		else
			selected[i] = array_union(selected[i], options);
	}

	eval("selected = arr.concat("+arrays+")");
	selected.sort(numsort);
	showproducts(selected);
}

function showproducts(selected)
{
	var html = '';
	var el = findEl("results");
	if (el)
	{
		matches = (selected.length == 1) ? "1 match" : selected.length + " matches";
		html ='<div align="right" class="matches">' + matches + " found</div>";
		for(var i=0; i<selected.length; i++)
		{
			imgstr = '';
			if (images[selected[i]] != '')
			{
				imgarray = images[selected[i]].split(',');
				for (j=0; j<imgarray.length; j++)
				{
					num = (imgarray.length > 1) ? " #" + (j+1) : "";
					if (imgstr != '')
						imgstr += " | ";
					imgstr += "<a href=\"javascript:image_popup('"+imgarray[j]+"')\">Kit Image" + num + "</a>";
				}
				imgstr += "<br />";
			}

			html += desc[selected[i]] + "<br />" + "<i>Product ID</i> - " + product_codes[selected[i]] + "<br />" + imgstr + "<br />";
		}
		el.innerHTML = html;
	}
}

function numsort(a, b)
{
	return a-b;
}

// Arrays must be sorted and unique
function array_union(ar1, ar2)
{
	var ret = new Array();
	var c2 = 0;
	var count = 0;
	var length2 = ar2.length;
	for (var c1=0; c1<ar1.length; c1++)
	{
		while (ar1[c1] > ar2[c2] && c2 < length2)
			c2++;
		if (c2 < length2 && ar1[c1] == ar2[c2])
			ret[count++] = ar1[c1];
	}

	return ret;
}

function clear_form()
{
	for(i=0; i<normal_fields.length; i++)
	{
		eval("el = document.tform." + normal_fields[i]);
		for (var j = 0; j < el.options.length; j++)
			el.options[j].selected = false;
	}

	for(i=0; i<add_fields.length; i++)
	{
		eval("el = document.tform." + add_fields[i]);
		for (var j = 0; j < el.options.length; j++)
			el.options[j].selected = false;
	}
}

function image_popup(img){
	/*//var a = window.open("assets/images/kit_config/"+img, 'popup', 'width=800,height=710,resizable=yes,scrollbars=yes');
	//a.focus();*/
	var a = openShadowbox("assets/images/kit_config/"+img, 'img', 'Kit Image');
}