// JavaScript Document
function chang_tab(tab_b){
	if(tab_b=="tab_menu_1"){
		document.getElementById("tab_1").style.display='block';		
		document.getElementById("tab_menu_1").className='active';		
	}
	else
	{
		document.getElementById("tab_1").style.display='none';		
		document.getElementById("tab_menu_1").className='';			
	}
	if(tab_b=="tab_menu_2"){
		document.getElementById("tab_2").style.display='block';		
		document.getElementById("tab_menu_2").className='active';		
	}
	else
	{
		document.getElementById("tab_2").style.display='none';		
		document.getElementById("tab_menu_2").className='';			
	}
	if(tab_b=="tab_menu_3"){
		document.getElementById("tab_3").style.display='block';		
		document.getElementById("tab_menu_3").className='active';		
	}
	else
	{
		document.getElementById("tab_3").style.display='none';		
		document.getElementById("tab_menu_3").className='';			
	}
	if(tab_b=="tab_menu_4"){
		document.getElementById("tab_4").style.display='block';		
		document.getElementById("tab_menu_4").className='active';		
	}
	else
	{
		document.getElementById("tab_4").style.display='none';		
		document.getElementById("tab_menu_4").className='';			
	}
	
}