function set_contrast( option )
{
	var body = document.body;
	switch(option)
	{
	case 'default':
		body.bgColor = "white";
		body.style.color = "black";
		break;
	
	case 'grey':
		body.bgColor = "grey";
		body.style.color = "black";
		break;
		
	case 'black':
		body.bgColor = "black";
		body.style.color = "yellow";
		break;
		
	default:
		option = "";
	}
	
	setCookie('contrast', option, 365);
	
}


function sn_text_resizer( text_size ){
    switch( text_size ) {
        case 'small':
            font_size = '.9em';
            break;
        case 'large':
            font_size = '1.1em';
            break;
        case 'xlarge':
            font_size = '1.2em';
            break;
        default:
            font_size = '1em';
    }
	
	document.body.style.fontSize = font_size;
	
	setCookie('size', text_size, 365)

}


function setTextOnly( condition )
{
	if(condition == 'true')
	{
		setCookie('text_only', 'true', 365);
	}
	else
	{
		setCookie('text_only', 'false', 365);
	}
}


//setCookie() and getCookie() taken from http://www.w3schools.com/JS/js_cookies.asp

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

function getCookie(c_name)
{
var i,x,y,ARRcookies=document.cookie.split(";");
for (i=0;i<ARRcookies.length;i++)
{
  x=ARRcookies[i].substr(0,ARRcookies[i].indexOf("="));
  y=ARRcookies[i].substr(ARRcookies[i].indexOf("=")+1);
  x=x.replace(/^\s+|\s+$/g,"");
  if (x==c_name)
    {
    return unescape(y);
    }
  }
}