var divs = new Array();
divs['menu'] = new Array('archives', 'cats');

function toggleDiv(divgroup, divid){
	for(i=0; i < divs[divgroup].length; i++) {
		if (divs[divgroup][i] != divid) {
			document.getElementById(divgroup + '_' + divs[divgroup][i]).style.display = 'none';
		}
	}
  if(document.getElementById(divgroup + '_' + divid).style.display == 'none'){
    document.getElementById(divgroup + '_' + divid).style.display = 'block';
  }else{
    document.getElementById(divgroup + '_' + divid).style.display = 'none';
  }
}