HTML code for search box that works across all Premium Shops.
<script type="text/javascript">
/****** required field ******/
// which shops to search (one or more shop IDs, comma-separated)
var cpsnippet_shopsearch_shopids = 'SHOPID_1,SHOPID_2';
/****** optional fields ******/
// if more than one shop, this is a list of shop names
// matched up with the shop IDs
var cpsnippet_shopsearch_shopnames = "SHOP_NAME1,SHOP_NAME2";
// if more than one shop, this is the default selection
var cpsnippet_shopsearch_defaultid = 'SHOPID';
// preset keyword in textbox (default is an empty box)
var cpsnippet_shopsearch_startterm = '';
// if preset keyword is set, clear the search box on focus (yes or no)
var cpsnippet_shopsearch_clearonfocus = 'yes';
// text before text box
// default: "Search:"
var cpsnippet_shopsearch_beforetext = 'Search: ';
// if more than one shop, text between text box and shop select box
// default: " in "
var cpsnippet_shopsearch_middletext = ' in ';
// text between text box and button
// (or, if more than one shop, between shop select box and button)
// default: blank
var cpsnippet_shopsearch_aftertext = '';
// button text
// default: "go"
var cpsnippet_shopsearch_buttontext = 'go';
</script>
<script src="http://www.cafepress.com/content/shop/snippets/searchbox.js" type="text/javascript"></script>