function EmailIsValid(email)
{
if( email.value.indexOf("@") == -1 ) return false;
else if( email.value.indexOf(".") == -1 ) return false;
else return true;
}

function ValidateFld(fldvalue,buf)
{
var i,ch;
for(i=0;i<fldvalue.length;i++)
{
ch = fldvalue.charAt(i);
if( buf.indexOf(ch) == -1 )return false;
}
return true;
}

function IsUNum(fldvalue){return ValidateFld(fldvalue,"0123456789.");}
function IsNum(fldvalue){return ValidateFld(fldvalue,"0123456789.-");}
function IsUInt(fldvalue){return ValidateFld(fldvalue,"0123456789");}
function IsInt(fldvalue){return ValidateFld(fldvalue,"0123456789-");}
function IsAlpha(fldvalue){return ValidateFld(fldvalue,"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMONPQRSTUVWXYZ");}
function IsAlphaNum(fldvalue){return ValidateFld(fldvalue,"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMONPQRSTUVWXYZ0123456789");}