function validEmail(email)
{invalidChars=" /:,;"
for(i=0;i<invalidChars.length;i++)
{badChar=invalidChars.charAt(i)
if(email.indexOf(badChar,0)>-1)
return false;}
atPos=email.indexOf("@",1)
if(atPos==-1)
return false;if(email.indexOf("@",atPos+1)!=-1)
return false;periodPos=email.indexOf(".",atPos)
if(periodPos==-1)
return false;if(periodPos+3>email.length)
return false;return true;}