[Mess4me]

MouseOver,
так?

var url = window.location.pathname;
    function give_me_badcom(){       
	if (url.replace(/[^0-9]/gim,'') == 10950)   
    {
   	var elem = document.querySelectorAll("div.hreview");
   
   	for (var i = 0; i < elem.length; i++) {
       elem[i].style.opacity = "0.5";
       elem[i].classList.add('newClass')
    
		}
    }
}