var valid=null;
var expression=/(\w+)@(\w+)\.(\w+)/;

function mailchecker(mailtocheck){    
    if(1==expression.test(mailtocheck)){
        return true;
    }
    else{
        return false;
    }
}

function check_required_fields(myform){
    var count=document.forms[myform].elements.length;
    var focusHelper=0;
    for(var i = 0; i < count; i++){
        if(document.forms[myform].elements[i].alt && "required" == document.forms[myform].elements[i].alt){
            if(""==document.forms[myform].elements[i].value){
                document.forms[myform].elements[i].style.background="#ff8822";
                if(0==focusHelper){
                    document.forms[myform].elements[i].focus();
                    focusHelper=1;
                }
            }
            else if("email"==document.forms[myform].elements[i].name){
                valid=mailchecker(document.forms[myform].elements[i].value);
                if(true==valid){
                    document.forms[myform].elements[i].style.background="";
                }
                else{
                    document.forms[myform].elements[i].style.background="#ff8822";
                    if(0==focusHelper){
                        document.forms[myform].elements[i].focus();
                        focusHelper=1;
                    }
                }
            }
            else{
                document.forms[myform].elements[i].style.background="";
            }
        }
        else{
            document.forms[myform].elements[i].style.background="";
        }
    }
    if(0==focusHelper){
        document.forms[myform].submit();
    }
}