A plugin to allow users to insert functional "Buy Now" buttons into a forum using Cash Mod.

buynow.js

var me = document.getElementById("brdwelcome").getElementsByTagName("strong")[0].innerHTML;
var j;
var posts = document.getElementsByClassName("postmsg");
for (j = 0; j < posts.length; j++) {
  var post = posts[j];
  var thishtml = post.innerHTML;
  var buttons = [];
  var i;
  for (i = 0; i < thishtml.split("[buynow]").length-1; i++) {
    buttons[i] = thishtml.split("[buynow]")[i+1].split("[/buynow]")[0];
  }

  for (i = 0; i < buttons.length; i++) {
    var username = buttons[i].split(",")[0];
    var amount = buttons[i].split(",")[1];
    if (amount != "x")
      thishtml = thishtml.replace(/\[buynow\](.+?)\[\/buynow\]/i, "<form action=\"donate.php\" method=\"post\">\r\n<div style=\"display: none !important;\"><input type=\"submit\" name=\"submit\" value=\"Donate\" /></div>\r\n<input type=\"hidden\" name=\"username\" value=\""+username.replace(/"/g, "\'")+"\" />\r\n<input type=\"hidden\" name=\"amount\" value=\""+parseInt(amount)+"\" />\r\n<input type=\"button\" value=\"Buy Now\" onclick=\"if (window.confirm('Do you really want to buy this item from "+username+" for $"+amount+"?')) { this.form.submit.click(); }\">\r\n</form>");
    else
      thishtml = thishtml.replace(/\[buynow\](.+?)\[\/buynow\]/i, "<form action=\"donate.php\" method=\"post\">\r\n<div style=\"display: none !important;\"><input type=\"submit\" name=\"submit\" value=\"Donate\" /></div>\r\n<input type=\"hidden\" name=\"username\" value=\""+username.replace(/"/g, "\'")+"\" />\r\n<input type=\"hidden\" name=\"amount\" value=\""+parseInt(amount)+"\" />\r\n<input type=\"button\" value=\"Buy Now\" onclick=\"var amt=parseInt(window.prompt('Enter amount to pay:'))+'';  this.form.amount.value=amt; if (window.confirm('Do you really want to buy this item from "+username+" for however much you entered?')) { this.form.submit.click(); }\">\r\n</form>");
  }

  post.innerHTML = thishtml;
}