function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}
function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}
var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		nano_intro_over = newImage("/images/intro-over.gif");
		general_directories_over = newImage("/images/general-over.gif");
		specialty_directories_over = newImage("/images/special-over.gif");
		about_us_over = newImage("/images/about-over.gif");
		searchBtn_over = newImage("/images/search-over.gif");
		preloadFlag = true;
	}
}
var onMenu;
var timeOn = null;
var menuActive = 0;
function showLayer(menu) {
  if (timeOn != null) {
    clearTimeout(timeOn);
    if (onMenu != menu) {
      closeMenu(onMenu);
    }
  }
  
  onMenu = menu;
  overButton = setTimeout("reallyShow('"+menu+"')",100);
  
}
function reallyShow(menu) {
  MM_showHideLayers(menu+'menu','','show');
  changeImages(menu, '/images/'+menu+'-over.gif');
}
function btnTimer() {
 if (overButton > 0) {
   clearTimeout(overButton);
 }
 timeOn = setTimeout("btnOut()", 1000);
}
function btnOut() {
  if (menuActive == 0) {
    MM_showHideLayers(onMenu+'menu','','hide');
    changeImages(onMenu,'/images/'+onMenu+'.gif');
  }
}
function subOver() {
  clearTimeout(timeOn);
  menuActive = 1;
}
function subOut(menu) {
 menuActive = 0;
 timeOn = setTimeout("closeMenu('"+menu+"')", 200);
}
function closeMenu(menu) {
  MM_showHideLayers(menu+'menu','','hide');
  changeImages(menu,'/images/'+menu+'.gif');
}
function MM_showHideLayers() {
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  if(document.getElementById){
    for (i=0; i<(args.length-2); i+=3){ 
      obj=tmt_findObj(args[i]);
      v=args[i+2];
      v=(v=='show')?'visible':(v='hide')?'hidden':v;
	  if(obj) {
	    obj.style.visibility=v;
	  }
	}
  } else {
    for (i=0; i<(args.length-2); i+=3) 
      if ((obj=MM_findObj(args[i]))!=null) { 
        v=args[i+2];
        if (obj.style) {
          obj=obj.style; 
          v=(v=='show')?'visible':(v='hide')?'hidden':v;
        }
        obj.visibility=v;
      }
  }
}
function MM_findObj(n, d) { //v3.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.string(p+1)].document; n=n.string(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document); return x;
}
function tmt_findObj(n){
	var x,t; if((n.indexOf("?"))>0&&parent.frames.length){t=n.split("?");
	x=eval("parent.frames['"+t[1]+"'].document.getElementById('"+t[0]+"')");
	}else{x=document.getElementById(n)}return x;
}


function writeEmail(host,username,text,extra) {
  document.write("<a href=\"mailto:"+username+"@"+host+"\" "+extra+"\">");
  if (text) {
    document.write(text);
  } else {
    document.write(username+"@"+host);
  }
  document.write("</a>");
}

function banner() {
  width = arguments[0];
  height = arguments[1];
  ids = new Array();
  if (arguments.length > 3) {
    for(i=2;i<arguments.length;i++) ids[ids.length] = arguments[i];
    id = ids[Math.round(Math.random()*(ids.length-1))];
  } else {
    id = arguments[2];
  }
  document.write("<a href=\"http://www.nanotech-now.com/banners/track.pl?banner_id="+id+"\"><img src=\"http://www.nanotech-now.com/banners/serve.pl?banner_id="+id+"\" width=\""+width+"\" height=\""+height+"\" border=\"0\"></a>");
}