var preloadFlag = false;  

function preloadImages() {
	if (document.images) {
		img1 = newImage("img/drop_bottom_left_d.gif");
		img2 = newImage("img/drop_bottom_left_l.gif");
		img3 = newImage("img/drop_bottom_right_d.gif");
		img4 = newImage("img/drop_bottom_right_l.gif");
		img5 = newImage("img/drop_top_left_d.gif");
		img6 = newImage("img/drop_top_left_l.gif");
		img7 = newImage("img/drop_top_right_d.gif");
		img8 = newImage("img/drop_top_right_l.gif");
		preloadFlag = true;
	}
} 
function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function over_sub_head (id1, id2, id3) {
	if (id1 != null) {
		document.getElementById(id1).className='head_left_l';
	}
	if (id2 != null) {
		document.getElementById(id2).className='green_light';
	}
	if (id3 != null) {
		document.getElementById(id3).className='head_right_l';
	}
	return true;
}

function sub_head(id1, id2, id3) {
	if (id1 != null) {
		document.getElementById(id1).className='head_left_d';
	}
	if (id2 != null) {
		document.getElementById(id2).className='green_dark';
	}
	if (id3 != null) {
		document.getElementById(id3).className='head_right_d';
	}
	return true;
}

function over_sub_footer(id1, id2, id3, id4) {
	if (id1 != null) {
		document.getElementById(id1).className='footer_left_l';
	}
	if (id2 != null) {
		document.getElementById(id2).className='green_light';
	}
	if (id3 != null) {
		document.getElementById(id3).className='footer_right_l';
	}
	if (id4 != null) {
		document.getElementById(id4).className='green_light';
	}
	return true;
}

function sub_footer(id1, id2, id3, id4) {
	if (id1 != null) {
		document.getElementById(id1).className='footer_left_d';
	}
	if (id2 != null) {
		document.getElementById(id2).className='green_dark';
	}
	if (id3 != null) {
		document.getElementById(id3).className='footer_right_d';
	}
	if (id4 != null) {
		document.getElementById(id4).className='green_dark';
	}
	return true;
}



/*выпадайки слева по клику */
function show_hide (tmp){
     if ((document.getElementById(tmp))&&(document.getElementById(tmp).style.display=='block')) 
          document.getElementById(tmp).style.display='none';
     else 
          if (document.getElementById(tmp)) 
               document.getElementById(tmp).style.display='block';     
}