function drop_menu(cen) {
    var t = document.getElementById('cdiv');
    if(t.style.display == "none") {
        document.getElementById('cdiv').style.display="";
        cen.className = "cenv3_drop_up";
        }
   	else {
    	document.getElementById('cdiv').style.display="none";
    	cen.className = "cenv3_drop_content";
    }
}
        	
function drop_data(pha) {
	var s = document.getElementById('sdiv');
	if(s.style.display == "none") {
		document.getElementById('sdiv').style.display="";
		pha.className = "arr_up_down1";
	}
	else {
		document.getElementById('sdiv').style.display="none";
		pha.className = "arr_up_down";
	}
}

function drop_data1(pha) {
	var s = document.getElementById('spdiv');
	if(s.style.display == "none") {
		document.getElementById('spdiv').style.display="";
		pha.className = "arr_up_down1";
	}
	else {
		document.getElementById('spdiv').style.display="none";
		pha.className = "arr_up_down";
	}
}