function check_focus(value){
	element=document.forms["email_friends"]["forward_email[]"][value];
	
	if(element.value=='                     @')
			element.value='';	
}
function check_blur(value){
	element=document.forms["email_friends"]["forward_email[]"][value];
	
	if(element.value=='')
			element.value='                     @';	
}
function check_friend_emails(){
	elements=document.forms["email_friends"]["forward_email[]"];
	
	for(i=0;i<elements.length;i++){
		element=document.forms["email_friends"]["forward_email[]"][i].value;
		if(element!='                     @'&&!is_valid_email(element)){
			alert('An email address you have entered is not a valid format');
			return false;
		}
	}
	document.forms["email_friends"].submit();
}
function is_valid_email(str) {
   return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
}
function hide_manual_email(){
	document.getElementById('email_chart').style.display='none';
}
function show_instant_msg(){
	document.getElementById('msg_chart').style.display='block';
}
function hide_instant_msg(){
	document.getElementById('msg_chart').style.display='none';
}
function show_manual_email(){
	document.getElementById('email_chart').style.display='block';
}
function hide_publicise(){
	document.getElementById('email_chart').style.display='none';
	document.getElementById('publicise').style.display='none';
}
function hide_chart_links(){
	document.getElementById('chart_links').style.display='none';
}
function show_chart_links(){
	document.getElementById('chart_links').style.display='block';
}