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Controllo formato indirizzo e-mail

if (document.formname.fieldname.value.length >0) {
    i=document.formname.fieldname.value.indexOf("@")
    j=document.formname.fieldname.value.indexOf(".",i)
    k=document.formname.fieldname.value.indexOf(",")
    kk=document.formname.fieldname.value.indexOf(" ")
    jj=document.formname.fieldname.value.lastIndexOf(".")+1
    len=document.formname.fieldname.value.length

    if ((i>0) && (j>(1+1)) && (k==-1) && (kk==-1) && (len-jj >=2) && (len-jj<=3)) {
    }
    else {
        alert("Please enter an exact email address.\n" +
        document.formname.fieldname.value + " is invalid.");
        return false;
    }

}