var showed = "1";

function setShowed(e){
	showed = e;
}

function hide(){		
	if( null != showed ){
		elem = document.getElementById("tabHolder_" + showed); 
		elem.className = '';
		elem = document.getElementById("block_" + showed);
		elem.className = 'hide';	
	}
}

function showTab(newTab){
	hide();
	setShowed(newTab);	
	elem = document.getElementById("tabHolder_" + showed); 
	elem.className = 'selected';
	elem = document.getElementById("block_" + showed);
	elem.className = 'show';	
}