function CharMode(iN)    
    {     
        if (iN>=48 && iN <=57)    
        return 1;     
        if (iN>=65 && iN <=90)  
        return 2;     
        if (iN>=97 && iN <=122)   
        return 4;     
        else     
        return 8;   
    }   
    function bitTotal(num)    
    {     
        modes=0;     
        for (i=0;i<4;i++)    
        {     
            if (num & 1) modes++;     
            num>>=1;     
        }     
        return modes;     
    }     
    function checkStrong(sPW)    
    {     
        if (sPW.length<=4)     
        return 0;
        Modes=0;     
        for (i=0;i<sPW.length;i++)    
        {     
            Modes|=CharMode(sPW.charCodeAt(i));     
        }     
        return bitTotal(Modes);     
    }     
    function pwStrength(pwd)    
    {     
        O_color="#eeeeee";     
        L_color="#FF0000";     
        M_color="#FF9900";     
        H_color="#33CC00";     
        if (pwd==null||pwd=="")    
        {     
            Lcolor=Mcolor=Hcolor=O_color;     
        }     
        else   
        {     
            S_level=checkStrong(pwd);     
            switch(S_level)    
            {     
                case 0:     
                Lcolor=Mcolor=Hcolor=O_color;     
                case 1:     
                Lcolor=L_color;     
                Mcolor=Hcolor=O_color;     
                break;     
                case 2:     
                Lcolor=Mcolor=M_color;     
                Hcolor=O_color;     
                break;     
                default:     
                Lcolor=Mcolor=Hcolor=H_color;     
            }     
        }     
        document.getElementById("strength_L").style.background=Lcolor;     
        document.getElementById("strength_M").style.background=Mcolor;     
        document.getElementById("strength_H").style.background=Hcolor;     
        return;     
    }