function getElementsByClassName(cn){
  var arr = new Array(); 
  var els = document.getElementsByTagName("*");
  var exp= new RegExp("^(.* )?"+cn+"( .*)?$", "g");
  for (var i = 0; i < els.length; i++ ){
    if (exp.test(els[i].className)){
      arr.push(els[i]);
    }
  }
  return arr;
}

function colums_height()
{
	var mainSize = document.getElementById('main-content').offsetHeight;
	var submenuSize = document.getElementById('submenu').offsetHeight;

	/*
	var frames = Array();
	var offsets = Array();
	frames['submenu'] = [document.getElementById('submenu-title'), document.getElementById('contact-form')];
	frames['main'] = [document.getElementById('main-content-top'), document.getElementById('main-content-bottom')];
	offsets['submenu'] = 0;
	offsets['main'] = 0;
		for(var i in frames)
		for(var j in frames[i]) {
			offsets[i] -= (parseInt(frames[i][j].currentStyle.marginTop) + parseInt(frames[i][j].currentStyle.marginBottom) + frames[i][j].offsetHeight);
		}
	document.writeln(submenuSize + ' ' + mainSize);
	*/	
	
	if(submenuSize > mainSize)
	{
		var main = document.getElementById('site-content');
		main.style.height = main.offsetHeight + submenuSize - mainSize - 35 + 'px';	
	}
	else if(submenuSize < mainSize)
	{
		var submenu = document.getElementById('submenu-main');
		submenu.style.height = submenu.offsetHeight + mainSize - submenuSize + 10 + 'px';	
	}
}

function menu_width()
{
	var menu_width = 820;
	var menu = document.getElementById('topmenu').getElementsByClassName('toplink');
	var items_size = 0;
	
	for(var i = 0; i < menu.length; i++)
		items_size += menu[i].offsetWidth;	

	var margin = Math.floor((menu_width - items_size) / i);
	
	for(var i = 0; i < menu.length; i++)
		menu[i].style.marginRight = margin + 'px';	

}

function banner_switch()
{
	var list = new Array();
	var i;
	for(i=1; i <= 4; i++)
	{
		list[i] = new Image();
		list[i].src = 'images/baner' + i + '.jpg';
	}
	
	i=1;
	
	while(i < 4)
	{
		setTimeout(function() { document.getElementById('banner').getElementsByTagName('img')[0].src = list[i].src },3000);
		i++;
		if(i == 4)
			i = 1;		
	}
}