function init(){
	//document.getElementById("signup").setAttribute("class","hidden");
	//alert ("loaded");

	//var list=document.getElementsByClassName('iconav','td');
	//setNaviWidth(list);
}


function getElementsByClassName(className,elementtype) {
  var a = [];
  var els = document.getElementsByTagName(elementtype);
  for ( var i = 0, j = els.length ; i < j ; i++ ) {
    if (els.item(i).className == className)
      a.push(els.item(i));
  }
  return a;
}


function showScreen(newscreen){
	// make a screen active (and hide the previous one
	var xtreme=getElementsByClassName("scr","tr");
	xtreme[0].className="scr hidden";
	document.getElementById(newscreen).className="scr";

	//make the navigation (top) show the active page
	var navi=getElementsByClassName("act","td");
	navi[0].className="dim";
	document.getElementById('tn_'+newscreen).className="act";

}


function setNaviWidth(elements){
	document.getElementById('tb').width=window.innerWidth;
	var wid=Math.min(Math.round(window.innerWidth/6),120);
	//document.write("yes");
	for (i=0;i<elements.length;i++){
		elements[i].width=wid;
		elements[i].height=wid;
	}
}