var selected_tab = 'day_1' ;

					

function select_tab(tab)

{

var head, content ;



head = document.getElementById(selected_tab + '_head') ;

content = document.getElementById(selected_tab + '_content') ;



if(head) head.className = 'tab_head' ;

if(content) content.className = 'tab_content' ;



head = document.getElementById(tab + '_head') ;

content = document.getElementById(tab + '_content') ;



if(head) head.className = 'tab_head_selected' ;

if(content) content.className = 'tab_content_selected' ;



selected_tab = tab ;

}