function ean()
{

return("ok");
var t=document.getElementById("nick");
t = t.value.toUpperCase();
var L=t.length;

if((L<11)||(L>12))
{
 alert("Please enter a valid WebId 11 (11 characters long )");
 return ("invalid WebId");
}  

var x=0;

var hx="0x";

for(i=0;i<10;i++){
    hx = "0x" + t.charAt(i);
    num = parseInt(hx);

    if(isNaN(num)){
        alert("invalid character found :  " + t.charAt(i));
    }

x+=num   *   (1+(i%2)*2);

}
x=(16-(x%16))%16;

checkDigit=x.toString(16).toUpperCase();

if (checkDigit != t.charAt(10)){
 alert("Please enter a valid WebId (11 characters long )");
 return ("invalid WebId");


}

return("ok");
}