snippet.js

jQuery.fn.quickCheckout = function( url ) {
  var form = $("<form />")
    .attr({ action:url, method:"POST"})
    .append("<input type='submit' />")
    .appendTo(this);
  this.data( "quickCheckoutForm" , form );
  return this;
}

jQuery.fn.quickCheckoutAdd = function( name , value) {
  if ( !this.data("quickCheckoutForm") ) { return this; }

  this.data("quickCheckoutForm")
    .append( $("<input type='hidden'/>").val(value).attr("name",name) );

  return this;
}

$("#shopping-cart")
  .quickCheckout("http://cohitre.com/handle/shoppingCart");