function hiddenLayer(id) {
	document.prev_id = id;
}

function showLayer(id) {
	document.getElementById("miko_" + document.prev_id).className = "miko_block";
	document.getElementById("miko_" + id).className = "miko_block_sel";
	document.getElementById("arrow_" + document.prev_id).style.visibility = "hidden";
	document.getElementById("arrow_" + id).style.visibility = "visible";
	
	document.getElementById("descr_" + document.prev_id).style.visibility = "hidden";
	document.getElementById("descr_" + id).style.visibility = "visible";
	document.prev_id = id;
}

function ResizeFont(id,param)
{
    param = parseFloat(param);
    var Element = document.getElementById(id);
    var FontSize = parseFloat(Element.style.fontSize);

    if((FontSize < 1.5 && param > 0) || (FontSize > 0.8 && param < 0)){
        Element.style.fontSize = (FontSize+param) + 'em';
	Alert(Element.style.fontSize);
    }
    if(param === 0){
        Element.style.fontSize = 1 + 'em';
    }
}