function setStyleSheet(size) {
		  
		  switch (size) {
		  case 2:
     		styleSheet = "_style/style_big.css";
			break;
  		  case 3:
     		styleSheet = "_style/style_huge.css";
	 		break;
	 	  default:
			styleSheet = "_style/style_normal.css";
  		  }
  		  
  		  document.cookie = "styleSheet=" + styleSheet;
  		  document.getElementById('style').href = styleSheet;
  		  return;
  	}