//**************************************************************************//
//*** The get cookie function:	This function get a cookie value by the  ***//
//*** cookie name														 ***//
//*** The in vars are	c_name = Cookie name to check					 ***//
//*** The out var is	"null" if cookie or value doesn't exist			 ***//
//***					The cookie value								 ***//
//**************************************************************************//
function getCookie(c_name) {
	// First we check to see if there is a cookie stored.
	// Otherwise the length of document.cookie would be zero.
	if (document.cookie.length > 0) {
		//Second we check if the name of the cookie we look for is
		//stored in the "document.cookie" object if it's 
		//not stored the return var will be -1
		c_start = document.cookie.indexOf(c_name + "=");
		if( c_start != -1) {
			//In the next two line we get the start index and
			//the end of the value stored in the cookie
			c_start += c_name.length + 1;
			c_end=document.cookie.indexOf(";",c_start);
			//If the varible exist we return it
			if(c_end==-1) 
			{
				return unescape(document.cookie.substring(c_start,document.cookie.length));				
			}
			else
			{
				return unescape(document.cookie.substring(c_start,c_end));
			}
		}
	}
	return null;
}

//**************************************************************************//
//*** The set cookie function:	This function set cookie to the client	 ***//
//*** The in vars are	c_name = Cookie name							 ***//
//***					c_value = The cookie value to set to			 ***//
//***					c_expire = The experiation time in minutes			 ***//
//*** The out var is	none											 ***//
//**************************************************************************//
function setCookie(c_name, c_value, c_expire) {
	// Three variables are used to set the new cookie. 
	// The name of the cookie, the value to be stored,
	// and finally the number of days until the cookie expires.
	// The first lines in the function convert 
	// the number of minutes to a valid date.
	var ExpireDate = new Date ();
	ExpireDate.setTime(ExpireDate.getTime() + (c_expire * 60 * 1000));
	// The next line stores the cookie, simply by assigning 
	// the values to the "document.cookie" object.
	// Note the date is converted to Greenwich Mean time using
	// the "toGMTstring()" function.
	document.cookie = c_name + "=" + escape(c_value) + 
	((c_expire == null) ? "" : "; expires=" + ExpireDate.toGMTString()) + +"; path=/";
}
//**************************************************************************//
//*** The check cookie function: This function check if a cookie with    ***//
//*** a desired value exist if exist return "true" if not set the        ***//
//*** and return "false" the return var are boolean                      ***//
//*** The in vars are	c_name = Cookie name							 ***//
//***					c_value = The expected value					 ***//
//***					c_expire = The experiation time in days			 ***//
//*** The out var is	true if the cookie value is as the expected one  ***//
//***					false if the cookie value is not as				 ***//
//***					the expected one								 ***//
//**************************************************************************// 
function checkCookie(c_name, c_value, c_expire) {
	//Here we check if the value of the cookie is
	//like we expected
	if( c_value == getCookie(c_name) ) {
		//Insert here the desired code if the match is ok
		//alert("cookie already set!!");
		return true;
	}
	//Here we set the cookie with the desired value
	setCookie(c_name, c_value, c_expire);
	//alert("cookie set!!");
	return false;
}