window.onload = function() {
	prepareSelOpt()
	}

function prepareSelOpt() {

	if(!document.getElementById) return false;
	if(!document.getElementsByTagName) return false;

	var sel_direct = document.getElementById('selOption');
	sel_direct.onchange = function() {selOptDirect(this.value); return false;}

	var prod_thumbs = document.getElementById('prod_thumbs');
	var thumb_links = prod_thumbs.getElementsByTagName("a");
	var j = thumb_links.length;
	for (var i=0; i<j; i++) {
		thumb_links[i].onclick = function() { 
									selOptSelect(this.id)
									selOptDirect(this.id);
									return false;
									}
		}
	}

function selOptSelect(request){
	
	var prod_sel = document.getElementById('selOption');
	var j = prod_sel.length;
	for (var i=0; i < j; i++) {	
		if (prod_sel.options[i].value == request) {prod_sel.selectedIndex = i;}
		}
	}


function selOptDirect(request){

	var pNaNu = request.split('_');
	
	var pNa = pNaNu[0]; 
	var pNu = pNaNu[1];
	
	var prod_pic = document.getElementById('prod_pic');
	var old_src = prod_pic.getAttribute("src");
	var old_src_left = old_src.split('_');
	var new_src = old_src_left[0] + '_' + pNu + '.jpg';
	
	var prod_link = document.getElementById('prod_link');
	var old_href = prod_link.getAttribute("href");
	var old_href_left = old_href.split('pNa=');
	var old_href_right = old_href.split('&act');
	var new_href = old_href_left[0] + 'pNa=' + pNa + '&act' + old_href_right[1];
	
	//var pattern_link = document.getElementById('pattern_link');
	//var old_href2 = pattern_link.getAttribute("href").split('/');
	//var new_href2 = '/'+ old_href2[1] + '/' + request;

	prod_pic.setAttribute("src", new_src);
	prod_link.setAttribute("href", new_href);
	//pattern_link.setAttribute("href", new_href2);
	}