var expDays = 30;
 var exp = new Date(); 
 exp.setTime(exp.getTime() + (expDays*24*60*60*1000));

 SetCookie('test','ret', exp);

function SetCookie (name, value) {  
var argv = SetCookie.arguments;  
var argc = SetCookie.arguments.length;  
var expires = (argc > 2) ? argv[2] : null;  
var path = (argc > 3) ? argv[3] : null;  
var domain = (argc > 4) ? argv[4] : null;  
var secure = (argc > 5) ? argv[5] : false;  
document.cookie = name + "=" + escape (value) + 
((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + 
((path == null) ? "" : ("; path=" + path)) +  
((domain == null) ? "" : ("; domain=" + domain)) +    
((secure == true) ? "; secure" : "");
}

function recom(ur) {
 win=window.open(ur,'Recomendation','toolbar=yes,width=650,height=500,directories=no,status=yes,scrollbars=yes,resize=no,menubar=yes')
}
function recom1(ur) {
 win=window.open(ur,'Recomendation','toolbar=yes,width=300,height=500,directories=no,status=yes,scrollbars=yes,resize=no,menubar=yes')
}
function recom2(ur) {
 win=window.open(ur,'Recomendation','toolbar=yes,width=550,height=500,directories=no,status=yes,scrollbars=yes,resize=no,menubar=yes')
}