function setMailWord()
{
	var strWord = "";
 
	var j, iChar;

	var aryCharMask = new Array();
	aryCharMask[0] = new Array();
	aryCharMask[0][0] = "A"; aryCharMask[0][1] = "Z";
	aryCharMask[1] = new Array();
	aryCharMask[1][0] = "a"; aryCharMask[1][1] = "z";
	aryCharMask[2] = new Array();
	aryCharMask[2][0] = "0"; aryCharMask[2][1] = "9";

	strWord = "";

	var iRange = aryCharMask[0][1].charCodeAt(0);
	for (j = 1; j < aryCharMask.length; j++) { iRange = Math.max(iRange, aryCharMask[j][1].charCodeAt(0)); }
	var iCount = 0;
	var lenWord = 4;
	while (iCount < lenWord) 
	{
		iChar = (Math.floor(Math.random() * iRange) + 1);
		// document.write("<br> iChar="  + iChar);
		// alert(String.fromCharCode(iChar));
		for (j = 0; j < 3; j++)
		{
			if ((iChar >= aryCharMask[j][0].charCodeAt(0)) && 
			    (iChar <= aryCharMask[j][1].charCodeAt(0)))
			{
				strWord += String.fromCharCode(iChar);
				++iCount;
				break;
			}
		}
	
	}
	return strWord.toLowerCase();
}