function amcInit(){
    setNav();
}


function setNav() {
	var urlA=document.URL.split('/');
    var e = urlA.length; 
    while(e-->0) {   // LOOP THROUGH THE URL ARRAY
		if (document.getElementById("mn")) {
		 	if (urlA[e] == "residential") {
				document.getElementById("mnR").className = "on";
			} else if (urlA[e] == "commercial") {
				document.getElementById("mnCom").className = "on";
			} else if (urlA[e] == "contact.php") {
				document.getElementById("mnC").className = "on";
			}
		}
		if (document.getElementById("sn")) {
		 	if (urlA[e] == "one") {
				document.getElementById("sn1").className = "on";
			} else if (urlA[e] == "two") {
				document.getElementById("sn2").className = "on";
			} else if (urlA[e] == "three") {
				document.getElementById("sn3").className = "on";
			}
		}
	} // end while loop
} // end setNav





window.addEventListener?window.addEventListener("load",amcInit,false):window.attachEvent("onload",amcInit);