// JavaScript Document



last_tab = 'tab1';
function show(layerName) {
document.getElementById(layerName).style.display = '';

}

function hide(layerName) {
document.getElementById(layerName).style.display = 'none';
}
function show_next(tab_name) {
	document.getElementById('tab1').className = 'tab';
		document.getElementById('tab2').className = 'tab';
		document.getElementById('tab3').className = 'tab';
		hide('tab2_data');
		hide('tab3_data');
		hide('tab1_data');
		
	document.getElementById(last_tab).className = 'tab';
	var curr = document.getElementById(tab_name);
	curr.className='tab_hover';
	
	hide(last_tab+'_data');
	show(tab_name+'_data');
	last_tab=tab_name;
}