window.onload = setScreenClass;    
    window.onresize = setScreenClass;

    if(document.addEventListener)
       document.addEventListener("DOMContentLoaded", setScreenClass, false);
	else
		if(document.readyState == "interactive")
			setScreenClass();
	   
    function setScreenClass(){
        var fmt = document.documentElement.clientWidth;
        var cls =
            (fmt<=1152)?'r960':
            (fmt>1152&&fmt<=1440)?'r1191':
            (fmt>1440&&fmt<=1680)?'r1422':
            (fmt>1680&&fmt<=1920)?'r1653':
            (fmt>=1920)?'r1653':'r1653';
            document.body.className = cls;
    };