JS: IGM quick bookmarklet

/* Bookmarklet:
javascript:(function(){with(document)(head.appendChild(createElement('script')).src='http://pastebin.com/raw.php?i=e3J0FyiP')._})();
This is a collection of a bunch of javascript codes for idlegamemaker. Untested.
Currently includes:
Multibuy (modified to have buy all instead of buy 10 and sell 100 added)
Import/export
Short numbers (modified to make it easy to edit and goes to infinity)
Autoclick (original, lets you autoclick one clickable at 20/s)
to see the code of one, control F "===--name--===". (without the quotes)

if someone can help me with how to make a box where you can enter your own number, it would be great. (I know how to use the built-in JS popup function I forget the name of, but that's inconvenient.)
  ===--MULTIBUY--===*/

(function()
{
if(l('saveBox').innerHTML.indexOf('<select name="multibuy">') == -1)
{
var somethingidk = '<select name="multibuy">';

for(i in Game.buildings)
{
if(Game.buildings[i].visible && Game.buildings[i].real)
{
somethingidk+= "<option value=" + Game.buildings[i].key + '>' + Game.buildings[i].name + '</option>';
}
}
somethingidk+= '</select>';
return l('saveBox').innerHTML += somethingidk + "<div class='button' onclick='buyall();'>Buy All</div>" + "<div class='button' onclick='buylots(100);'>Buy 100</div>" + "<div class='button' onclick='sellall();'>Sell all</div>" + "<div class='button' onclick='sell100();'>Sell 100</div>";
}
}())

sellall = function()
{
var build = document.getElementsByName('multibuy')[0].selectedOptions[0].value;
if(Game.cssData.indexOf(".sell") == -1 && Game.cssData.indexOf("#sell-" + Game.buildings[build].key) == -1)
{
if(confirm('Are you sure you want to sell all ' + Game.buildings[build].plural + '?'))
{
while(Game.buildings[build].amount > 0 && Game.buildings[build].visible)
{
Game.buildings[build].Sell();
}}}}

sell100 = function(){
var build = document.getElementsByName('multibuy')[0].selectedOptions[0].value;
for(i=0;i<100;i++){
if(Game.cssData.indexOf(".sell") == -1 && Game.cssData.indexOf("#sell-" + Game.buildings[build].key) == -1){
if(confirm('Are you sure you want to sell 100 ' + Game.buildings[build].plural + '?')){
if(Game.buildings[build].amount > 0 && Game.buildings[build].visible){
Game.buildings[build].Sell();
}}}}}

buyall = function(){
var build = document.getElementsByName('multibuy')[0].selectedOptions[0].value;
while(Game.buildings[build].visible && Game.buildings[build].CanBuy()){
Game.buildings[build].Buy();
}}

buylots = function(amount)
{
var build = document.getElementsByName('multibuy')[0].selectedOptions[0].value;
for(i=0;i<amount;i++)
{
if(Game.buildings[build].visible && Game.buildings[build].CanBuy())
{
Game.buildings[build].Buy();
}}}

with(l('saveBox')){
if(innerHTML.indexOf("confirm('Are you sure you want to reset?')") == -1) innerHTML = innerHTML.replace("Game.Reset()","if(confirm('Are you sure you want to reset?')){Game.Reset()}")}

document.getElementsByName('multibuy')[0].onfocus=function(){
multbuyopt = '';
for(i in Game.buildings)
{
if(Game.buildings[i].visible && Game.buildings[i].real)
{
multbuyopt+= "<option value=" + Game.buildings[i].key + '>' + Game.buildings[i].name + '</option>';
}}
document.getElementsByName('multibuy')[0].innerHTML = multbuyopt;}

/*===--IMPORT/EXPORT--===*/
(function(){with(document)(head.appendChild(createElement('script')).src='http://pastebin.com/raw.php?i=C1kJemmr')._})();
/* not even gonna bother editing this one yet. Might change it a bit in the future though.
  ===--SHORT NUMBERS--===*/
nums = ['k','M','B','T',' Qa',' Qi',' Sx',' Sp',' Oc',' Nn'];
nums2= ['',' U',' D',' T',' Qa',' Qi',' Sx',' Sp',' Oc',' Nn'];
nums3= ['Dc','Vg','Tg','Qag','Qig','Sxg','Spg','Ocg','Nng','Cc'];
//if you want to modify this, note that nums is only for up to a decillion-0.001. nums2 gets used after that with nums3 placed after it. nums2 will reset after it gets to it's 10th entry instead increasing nums3.
function Beautify(num,floats)
{
if (!isFinite(num)) return 'Infinity';
if(num < 1e3) return (Math.round((num*1000)/1000));
var i = 0;
var j = 0;
while(num>=1e33){
num/=1e30;
j++;
i=-1;}
while(num >= 1000)
{
num/=1000;
i++;
}
num = Math.round(num*1000)/1000;
if(num>=1000)
{
num/=1000;
i++;
num = Math.round(num*1000)/1000;
} //deals with rounding errors
num = num.toString();
if(num.indexOf('.') == -1) num += '.000';
else
{
dec = num.indexOf('.');
while(num.slice(dec,num.length).length < 4) num += '0'; //adds trailing 0s (if needed) to stop the numbers jumping around.
}
if(j=0) return num + nums[i - 1];
return num + nums2[i] + nums3[j-1];
}
/* This takes you in infinity.
  ===--AUTOCLICK--===*/
(function(){
if(l('saveBox').innerHTML.indexOf('<select name="autoclick">') == -1){
var somethingidk = '<select name="autoclick">';
for(i in Game.clickables){
if(Game.clickables[i].visible && Game.clickables[i].real){
somethingidk+= "<option value=" + Game.clickables[i].key + '>' + Game.clickables[i].name + '</option>';
}}
somethingidk+= '</select>';
return l('saveBox').innerHTML += somethingidk + "<div class='button' onclick='autoclick(1);'>Autoclick! (20/s)</div>" + "<div class='button' onclick='autoclick(0);'>Stop Autoclicking</div>";
}}())

autoclick=function(what){
clearInterval(autoclicker);
if(what==1){
var click = document.getElementsByName('autoclick')[0].selectedOptions[0].value;
autoclicker=setInterval(click.Click(), 50);}
/* Yep, something original! If 20/s is too much, I suppose I could add a few slower options (8, 10, 12, 14, 16, 18, 22, 24, and 26?)*/