function setCurrentTab(tab) {
  var nav = document.getElementById('nav');
  for (i = 0; i < nav.childNodes.length; i ++) {
    if (nav.childNodes[i].nodeName == 'LI') {
      for (j = 0; j < nav.childNodes[i].childNodes.length; j ++) {
        if (nav.childNodes[i].childNodes[j].nodeName == 'A') {
          if (nav.childNodes[i].childNodes[j].innerHTML == tab || tab == '') {
            nav.childNodes[i].className = 'current';
          }
        }    
      }
    }
  }
}

// Navigation Bar JavaScript Document
function showlayer(layer){
var myLayer = document.getElementById(layer);
if(myLayer.style.display=="none" || myLayer.style.display==""){
myLayer.style.display="block";
} else {
myLayer.style.display="none";
}
}

function showsublayer(layer){
	var myLayer = document.getElementById(layer);
	if(myLayer.style.display=="none" || myLayer.style.display==""){myLayer.style.display="block";}
}

function hidesublayer(layer){
	var myLayer = document.getElementById(layer);
	if(myLayer.style.display=="block"){myLayer.style.display="none";}
}

function hideotherlayer(val){
	if (val == 1) {
		hidesublayer('sm_2');
		hidesublayer('sm_3');
		hidesublayer('sm_4');
		hidesublayer('sm_5');
		hidesublayer('sm_6');
		hidesublayer('sm_7');
	}
	else if (val == 2) {
		hidesublayer('sm_1');
		hidesublayer('sm_3');
		hidesublayer('sm_4');
		hidesublayer('sm_5');
		hidesublayer('sm_6');
		hidesublayer('sm_7');
	}
	else if (val == 3) {
		hidesublayer('sm_1');
		hidesublayer('sm_2');
		hidesublayer('sm_4');
		hidesublayer('sm_5');
		hidesublayer('sm_6');
		hidesublayer('sm_7');
	}
	else if (val == 4) {
		hidesublayer('sm_1');
		hidesublayer('sm_2');
		hidesublayer('sm_3');
		hidesublayer('sm_5');
		hidesublayer('sm_6');
		hidesublayer('sm_7');
	}		
	else if (val == 5) {
		hidesublayer('sm_1');
		hidesublayer('sm_2');
		hidesublayer('sm_3');
		hidesublayer('sm_4');
		hidesublayer('sm_6');
		hidesublayer('sm_7');
	}
	else if (val == 6) {
		hidesublayer('sm_1');
		hidesublayer('sm_2');
		hidesublayer('sm_3');
		hidesublayer('sm_4');
		hidesublayer('sm_5');
		hidesublayer('sm_7');
	}	
	else if (val == 7) {
		hidesublayer('sm_1');
		hidesublayer('sm_2');
		hidesublayer('sm_3');
		hidesublayer('sm_4');
		hidesublayer('sm_5');
		hidesublayer('sm_6');
	}	
}