function changeCity(){
	var cities = document.getElementById('cities_block');
	var container = document.getElementById('container');
	cities.style.visibility = 'visible';
	/*var citiesCopy = cities.cloneNode(true);
	citiesCopy.id = 'cities_block_copy';
	citiesCopy.className = 'cities_block cities_block_copy';
	document.body.insertBefore(citiesCopy, container);
	citiesCopy.style.left = (cities.parentNode.offsetLeft + 0)+'px';
	citiesCopy.style.top = (cities.offsetTop + container.offsetTop)+'px';*/
	//alert(cities.offsetLeft + cities.parentNode.offsetLeft);

	
	
	var shape = document.createElement('div');
	shape.id = 'shape';
	var pageSize = getPageSize();
	shape.style.width = pageSize[0]+"px";
	shape.style.height = pageSize[1]+"px";
	//document.body.insertBefore(shape, container);
	cities.parentNode.insertBefore(shape, cities);
}

function closeChangeCity()
{
	var shape = document.getElementById('shape');
	shape.parentNode.removeChild(shape);
	//document.body.removeChild(document.getElementById('cities_block_copy'));
	document.getElementById('cities_block').style.visibility = 'hidden';
}

function getPageSize() {
		
	 var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = window.innerWidth + window.scrollMaxX;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	
	if (self.innerHeight) {	// all except Explorer
		if(document.documentElement.clientWidth){
			windowWidth = document.documentElement.clientWidth; 
		} else {
			windowWidth = self.innerWidth;
		}
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = xScroll;		
	} else {
		pageWidth = windowWidth;
	}

	return [pageWidth,pageHeight];
}

function changeCourses(){
	var block = document.getElementById('courses_block');
	var els = block.getElementsByTagName('div');
	for(i=0; i<els.length; i++){
		if(els[i].className=='select'){
			if(els[i].style.display=='none'){
				els[i].style.display = '';
			}else{
				els[i].style.display = 'none';
			}
		}
	}
	
	var els = block.getElementsByTagName('table');
	for(i=0; i<els.length; i++){
		if(els[i].style.display=='none'){
			els[i].style.display = '';
		}else{
			els[i].style.display = 'none';
		}
	}
}