function openMain(div_show){
	divMap = document.getElementById("main_map");
	divCat = document.getElementById("main_cat");
	divMap.style.display='none';
	divCat.style.display='none';

	if ( div_show == 'main_map' ) {
		divMap.style.display='block';
	} 
	if ( div_show == 'main_cat' ) {
		divCat.style.display='block';
	} 
}