Basically it takes your url & params and dynamically builds the DOM for the form and then submits it.

Requires that you include prototype.js.

Here is an example link. You just pass the url you wish to submit to and an associative array of the params.

post the request

Here is the js function. Include this in the head of your page.

/*
* Dynamically creates a form based on args and submits it to the given url
* @param {Object} url
* @param {Object} params
*/
function post_from_link(url,params){
   var form = new Element('form', { action: url, method: 'POST' });
   for(param in params){
       var hidden = new Element('input', {type:'hidden', name:param, value:params[param]});
       form.insert(hidden);
   }
   document.body.appendChild(form);
   form.submit();
}