<script language=javascript>
<!--
function Charstring(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 modetotal(num){      
modes=0;
for (i=0;i<4;i++){
if (num & 1) 
	modes++;
	num>>>=1;
}
return modes;
}

function checkpwd(spwd){   
if (spwd.length<=4)
return 0;                         
Modes=0;
for (i=0;i<spwd.length;i++){         
	Modes|=Charstring(spwd.charCodeAt(i));
}
return modetotal(Modes);
} 

function pwdstrong(pwd){       
O_color="#cccccc";              
L_color="#ffff00";               
M_color="#DC440F";                
H_color="#FF0000";                  
if (pwd==null||pwd==''){             
	Lcolor=Mcolor=Hcolor=O_color;   
} 
else{
	S_level=checkpwd(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("pwd_L").style.background=Lcolor;    
document.getElementById("pwd_M").style.background=Mcolor; 
document.getElementById("pwd_H").style.background=Hcolor; 
return;
}
//-->
</script>

<form>
输入密码:<input type=password size=30 onKeyUp=pwdstrong(this.value) onBlur=pwdstrong(this.value)>
<br>密码强度:
<table border=1 cellspacing=0 cellpadding=1 bordercolor=#cccccc height=22 style='display:inline'>
	<tr align="center" bgcolor="#eeeeee"> 
		<td width=40 id="pwd_L">弱</td>
		<td width=40 id="pwd_M">中</td>
		<td width=40 id="pwd_H">强</td>
	</tr>
</table>
</form>