function checkMailId(mailaddress)
           {
              if (mailaddress.length >0) {
	 i=mailaddress.indexOf("@")
	 j=mailaddress.indexOf(".",i)
	 k=mailaddress.indexOf(",")
	 kk=mailaddress.indexOf(" ")
	 jj=mailaddress.lastIndexOf(".")+1
	 len=mailaddress.length

 	if ((i>0) && (j>(1+1)) && (k==-1) && (kk==-1) && (len-jj >=2) && (len-jj<=3)) {
 	}
 	else {
 		alert("Please enter a correct email address.\n" +
		mailaddress + " is not valid format.");
		return false;
 	}
 }