function passwordStrength(password)
{
	var desc = new Array();
	desc[0] = "Null";
	desc[1] = "Weak";
	desc[2] = "Medium";
	desc[3] = "Strong";


	var score   = 0;

	//if password bigger than 6 give 1 point
	if ((password.length > 0) && (password.length <= 5)) 
	{
	   score = 1;
	}else if((password.match(/\d+/)) && (password.match(/[a-z]/)) && (password.match(/[A-Z]/)) && (password.length > 5))
	{
	   score = 3;
	}else if ((password.match(/\d+/)) || (password.length > 5))
	{
	   score = 2;
	}
	 document.getElementById("passwordDescription").innerHTML = desc[score];
	 document.getElementById("passwordStrength").className = "strength" + score;
}