var last_tab = 'tab1';

function show(layerName) {
	//alert(document.getElementById(layerName).style.display);
	document.getElementById(layerName).style.display = 'block';
}

function hide(layerName) {
	document.getElementById(layerName).style.display = 'none';
}
function show_next(tab_name) { 
	document.getElementById(last_tab).className = 'tab';
	var curr = document.getElementById(tab_name); 
	curr.className='tab_hover'; 
	//hide(last_tab+'_data');
	if(document.getElementById(tab_name+'_data').style.display == 'block'){ 
		document.getElementById(tab_name+'_data').style.display = 'none'; 
		curr.className='tab'; 
	}
	else{ 
		hideAll(tab_name+'_data'); 
		//document.getElementById(tab_name+'_data').style.display = 'block';
		curr.className='tab_hover'; 
	}
	//hideAll(); 
	//show(tab_name+'_data');
	last_tab=tab_name; 
}
function hideAll(dt){
	for(var i=1; i<=33;i++){
		var tabdata = "tab"+i+"_data";
		if (document.getElementById(tabdata)) {
			document.getElementById(tabdata).style.display='none';
		}
	}
	if(dt) {
		document.getElementById(dt).style.display='block';
	}
}