function show_cat () {document.getElementById("button_cat").style.visibility='visible';}
function hide_cat(){document.getElementById("button_cat").style.visibility='hidden'; }

function show_ul_cat () {document.getElementById('ul_cat').style.display ='block' ;document.getElementById('lab_cat').className='lab_cat_select' }
function hide_ul_cat(){document.getElementById('ul_cat').style.display ='none' ;document.getElementById('lab_cat').className='lab_cat' }

function show_cat(){
	
	 if(document.getElementById('ul_cat').style.display !='block'){ show_ul_cat() }else{ hide_ul_cat()}
	}