function setFocus(aField) {
document.forms[0][aField].focus();
}

function isAnEmailAddress(aTextField) {
// 1+@3+ [or x@x.x] is as close as we will test

if (document.forms[0][aTextField].value.length<5) {
return false;
}
else if (document.forms[0][aTextField].value.indexOf("@") < 1) {
return false;
}
else if (document.forms[0][aTextField].value.length - document.forms[0][aTextField].value.indexOf("@") < 4) {
return false;
}
else { return true; }
}

function isEmpty(aTextField) {
if ((document.forms[0][aTextField].value.length==0) || (document.forms[0][aTextField].value==null)) {
return true;
}
else { return false; }
}

function validate() {

// Step 1: check that required fields are
// filled in, alert and exit without
// submitting if not

// check that the name field is valued
if (isEmpty("Name")) {
	alert("Please fill in all required fields.");
	setFocus("Name");
	return false;
}

if (isEmpty("Company")) {
	alert("Please fill in all required fields.");
	setFocus("Company");
	return false;
}

// check that the email field is valued
if (isEmpty("Email")) {
	alert("Please fill in all required fields.");
	setFocus("Email");
	return false;
}


// Step 2: check that the email address is
// even close, alert and exit without
// submitting if not
if (!isAnEmailAddress("Email")) {
	alert("The entered email address is invalid.");
	setFocus("Email");
	return false;
}

if (isEmpty("Comments")) {
	alert("Please fill in all required fields.");
	setFocus("Comments");
	return false;
}

// if we get this far everthing is ok, so
// let the form submit
return true;

}

<!-- Begin
var n;
var p;
var p1;
function ValidatePhone(){
p=p1.value
if(p.length==3){
	//d10=p.indexOf('(')
	pp=p;
	d4=p.indexOf('(')
	d5=p.indexOf(')')
	if(d4==-1){
		pp="("+pp;
	}
	if(d5==-1){
		pp=pp+")";
	}
	//pp="("+pp+")";
	document.order.Phone.value="";
	document.order.Phone.value=pp;
}
if(p.length>3){
	d1=p.indexOf('(')
	d2=p.indexOf(')')
	if (d2==-1){
		l30=p.length;
		p30=p.substring(0,4);
		//alert(p30);
		p30=p30+")"
		p31=p.substring(4,l30);
		pp=p30+p31;
		//alert(p31);
		document.order.Phone.value="";
		document.order.Phone.value=pp;
	}
	}
if(p.length>5){
	p11=p.substring(d1+1,d2);
	if(p11.length>3){
	p12=p11;
	l12=p12.length;
	l15=p.length
	//l12=l12-3
	p13=p11.substring(0,3);
	p14=p11.substring(3,l12);
	p15=p.substring(d2+1,l15);
	document.order.Phone.value="";
	pp="("+p13+")"+p14+p15;
	document.order.Phone.value=pp;
	//obj1.value="";
	//obj1.value=pp;
	}
	l16=p.length;
	p16=p.substring(d2+1,l16);
	l17=p16.length;
	if(l17>3&&p16.indexOf('-')==-1){
		p17=p.substring(d2+1,d2+4);
		p18=p.substring(d2+4,l16);
		p19=p.substring(0,d2+1);
		//alert(p19);
	pp=p19+p17+"-"+p18;
	document.order.Phone.value="";
	document.order.Phone.value=pp;
	//obj1.value="";
	//obj1.value=pp;
	}
}
//}
setTimeout(ValidatePhone,100)
}
function getIt(m){
n=m.name;
//p1=document.forms[0].elements[n]
p1=m
ValidatePhone()
}
function testphone(obj1){
p=obj1.value
//alert(p)
p=p.replace("(","")
p=p.replace(")","")
p=p.replace("-","")
p=p.replace("-","")
//alert(isNaN(p))
if (isNaN(p)==true){
alert("Check phone");
return false;
}
}

// copyright 1999 Idocs, Inc. http://www.idocs.com
// Distribute this script freely but keep this notice in place
function numbersonly(myfield, e, dec)
{
var key;
var keychar;

if (window.event)
   key = window.event.keyCode;
else if (e)
   key = e.which;
else
   return true;
keychar = String.fromCharCode(key);

// control keys
if ((key==null) || (key==0) || (key==8) ||
    (key==9) || (key==13) || (key==27) )
   return true;

// numbers
else if ((("0123456789").indexOf(keychar) > -1))
   return true;

// decimal point jump
else if (dec && (keychar == "."))
   {
   myfield.form.elements[dec].focus();
   return false;
   }
else
   return false;
}

//-->