Change the css file loaded after the resolution

hi,
I would like to modify the css file loaded after the resolution of the visitor.
I already found her:

Code:

---

          if ((screen. width> = 1900) & & (screen. height> = 1200))
  (

  )

---

My problem is that I can not implement the html (<link href=""/>) between the brackets.

Thank you in advance

HTML

Code:

---

<link href= "ton/style/par/defaut.css" rel= "stylesheet" id= "style" />

---

JavaScript

Code:

---

document. getElementById ( 'style'). href = 'path / to / stylsheet.css';

---

Thank you very much!
That is to change the size of certain images. the JS disabled make any less harmonious but not dramatic.
I will see if the precise size is recovered each time.
thank you again.

Quote:

---

My problem is that I can not implement the html (<link href=""/>) between the brackets.

---

You can put a width and height as a% to your images ...