var c = 1;
var m = 6;
function hide_frame(k) {	
	for (r=1; r<=m; r++) {
		document.getElementById('tab_'+r).className = "down";	
		document.getElementById('frm_'+r).className = "hide";
	}
	document.getElementById('tab_'+k).className = "up";
	document.getElementById('frm_'+k).className = "show";
	return false;
}
function next_tab() {
	c++;
	if (c>m) c=1;
	for (b=1; b<=m; b++) {
		document.getElementById('tab_'+b).className = "down";	
		document.getElementById('frm_'+b).className = "hide";
	}
	document.getElementById('tab_'+c).className = "up";
	document.getElementById('frm_'+c).className = "show";
	return false;
}