function decrypt(str){
    var key = str.substring(0,6);
    var phrase = str.substring(6,str.length);
    
    var out='';
    var mcc=0;
    var de_mcc;
    var keyIndex = -1;
    var keys = '';
    var ou = '';
    
    for(var i=0;i<phrase.length;i+=2){
	mcc = phrase.substring(i,i+2);
	if(keyIndex != 5)
	    keyIndex = keyIndex+1;
	else
	    keyIndex=0;
	keys += keyIndex;
	de_mcc = parseInt(mcc, 16);
	de_mcc = de_mcc ^ key.charCodeAt(keyIndex);
	out = out + String.fromCharCode(de_mcc);
    }
    return out;
}