function close_welcome () {
	document.getElementById('home_welcome_container').style.display = 'none';
	setCookie('lancet_welcome','closed',1);
}

function getCookie(c_name)
{
	if (document.cookie.length > 0)
	  {
	  c_start=document.cookie.indexOf(c_name + "=");
	  if (c_start!=-1)
	    { 
	    c_start=c_start + c_name.length+1 ;
	    c_end=document.cookie.indexOf(";",c_start);
	    if (c_end==-1) c_end=document.cookie.length
	    return unescape(document.cookie.substring(c_start,c_end));
	    } 
	  }
	return ""
}

function setCookie(c_name,value,expiredays)
{
	var exdate=new Date();
	exdate.setDate(exdate.getDate()+expiredays);
	document.cookie=c_name+ "=" +escape(value)+((expiredays==null) ? "" : "; expires="+"");
}

function check_welcome_cookie () {
	var tmpcookieval = getCookie('lancet_welcome');
	if (tmpcookieval == "closed") {
		document.getElementById('home_welcome_container').style.display = 'none';
	}
}

function check_home__tab_cookies () {
	// if TWIM tab was last selected ... make it visible
	tmpcookieval = getCookie('lancet_tabs_onlinefirst_twim');
	if (tmpcookieval == "twim") {
		document.getElementById('home_news_tab2').className = "selected";
		document.getElementById('home_news_tab1').className = "";
		document.getElementById('home_onlinefirst').style.display = 'none';
		document.getElementById('home_twim').style.display = 'block';
	}

	// if AUDIO tab was last selected ... make it visible
	tmpcookieval = getCookie('lancet_tabs_video_audio');
	if (tmpcookieval == "audio") {
		document.getElementById('home_multimedia_tab2').className = "selected";
		document.getElementById('home_multimedia_tab1').className = "";
		document.getElementById('home_video').style.display = 'none';
		document.getElementById('home_podcasts').style.display = 'block';
	}

	// ATL tab was selected
	if (tmpcookieval == "atl") { 
		document.getElementById('home_video').style.display = 'none';
		document.getElementById('home_multimedia_tab1').className = "";
		document.getElementById('home_multimedia_tab2').className = "none";
		document.getElementById('home_podcasts').style.display = '';
		document.getElementById('home_atl').style.display = 'selected';
		document.getElementById('home_multimedia_tab3').className = "block";
	}
	
	// if MOST CITED tab was last selected ... make it visible
	tmpcookieval = getCookie('lancet_tabs_mostread_mostcited');
	if (tmpcookieval == "mostcited") {
		document.getElementById('home_mosttab0').className = "selected";
		document.getElementById('home_mosttab1').className = "";
		document.getElementById('home_mostread').style.display = 'none';
		document.getElementById('home_mostcited').style.display = 'block';
	}
}