function changeThumbnail(imgSrc)
{
	document.getElementById('product_preview').src = imgSrc;
}

function getQuerystring(key, default_)
{
	  if (default_==null) default_="";
	  key = key.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
	  var regex = new RegExp("[\\?&]"+key+"=([^&#]*)");
	  var qs = regex.exec(window.location.href);
	  if(qs == null)
	    return default_;
	  else
	    return qs[1];
} 

function tab(group, item)
{
	$("div"+group).fadeOut();	
	$("div"+item).fadeIn();

	$("a"+group).removeClass("active");	
	$("a"+item).addClass("active");
}

var tab_group = getQuerystring('tab_group');
var tab_item = getQuerystring('tab_item'); 


$(document).ready(function(){
	if ((tab_group != "") && (tab_item != ""))
	{
		tab(tab_group, tab_item);
	 
	}
	
	
	$("#coupon_check").click(function() {
		if ($("#coupon_check").attr("checked") == true)
		{
			$(".coupon_input").slideDown();		
		}
		else
		{
			$(".coupon_input").slideUp();
			$("#coupon").val("");
		}

	});

	
});