Uncaught TypeError [closed]

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Can anyone explain what is theses errors?

Uncaught TypeError: Cannot set property 'innerHTML' of null

Uncaught TypeError: Cannot read property 'style' of null

Uncaught SyntaxError: Unexpected token ILLEGAL

Uncaught TypeError: Object # has no method 'dispatchEvent'

This is my test Website

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At some point in the page you have:

function display_price(price, oid)
{
    ...

    element = document.getElementById(oid);
    if (valor != 'NaN' && valor != null && valor != '')
    {
       element.innerHTML = valor + money_simbol;

The last line is causing the error because element is null. You should add a condition to the if(): that is, change this line:

if (valor != 'NaN' && valor != null && valor != '')

to this:

if (element && valor != 'NaN' && valor != null && valor != '')

In other words, it's a good practice to always check the return value of a function before accessing its properties.

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You call the function display_price passing it ID of span that does not yet exist.

Change this line: (appears twice in your code)

display_price('510', 'products_price_id');

To this instead:

window.onload = function() {
   display_price('510', 'products_price_id');
};

This will wait until the page loads before trying to find the element, thus solve your errors.