function emailvalidation(entered, alertbox)
{
with (entered)
{
apos=value.indexOf("@"); 
dotpos=value.lastIndexOf(".");
lastpos=value.length-1;
if (apos<1 || dotpos-apos<2 || lastpos-dotpos>3 || lastpos-dotpos<2) 
{if (alertbox) {alert(alertbox);} return false;}
else {return true;}
}
}

function required(field,alerttxt)
{
with (field)
{
if (value==null||value=="")
  {alert(alerttxt);return false}
else {return true}
}
} 

function formvalidation(submit)
{
with (submit)
{
if (emailvalidation(email,"Your EMAIL is invalid & required, please check it & re-try, thank you.")==false) {email.focus(); return false;};
if (required(details,"The DETAILS BOX is empty, please add your information here, thank you.")==false) {details.focus(); return false;};
if (required(name,"Please enter you NAME for reference, thank you.")==false) {name.focus(); return false;};
}
}