Java Script For Validation

<scriptlanguage="JavaScript">
	<!--
	function IsNumeric(sText)
	{
	var ValidChars = ",-()+0123456789 ";
	var IsNumber=true;
	var Char;
	for (i = 0; i < sText.length && IsNumber == true; i++)
	{
	Char = sText.charAt(i);
	if (ValidChars.indexOf(Char) == -1)
	{
	IsNumber = false;
	}
	}
	return IsNumber;
	}
	function validate()
	{
	if(document.form.name.value=="")
	{
	alert("Please Enter Value for Name Field");
	document.form.name.focus();
	return false;
	}
	if(document.form.email.value=="")
	{
	alert("Please Enter Value for E-Mail Field");
	document.form.email.focus();
	return false;
	}
	if(!isEmail(document.form.email.value))
	{ alert("Please enter the valid email address.");
	document.form.email.select();
	document.form.email.focus();
	return false; }
	if(document.form.phone.value=="")
	{
	alert("Please Enter Value for Telephone Field");
	document.form.phone.focus();
	return false;
	}
	if (!IsNumeric(document.form.phone.value))
	{
	alert ('Phone number seems incorrect!');
	document.form.phone.focus();
	return (false);
	}
	if(document.form.firstChoice.value=="")
	{
	alert("Please Select Project/Location");
	document.form.firstChoice.focus();
	return false;
	}
	if(document.form.secondChoice.value=="")
	{
	alert("Please Select Project/Location");
	document.form.secondChoice.focus();
	return false;
	}
	if(document.form.thirdChoice.value=="")
	{
	alert("Please Select Project/Location");
	document.form.thirdChoice.focus();
	return false;
	}
	if(document.form.appbudg.value=="")
	{
	alert("Please Select Your Budget");
	document.form.appbudg.focus();
	return false;
	}
	if(document.form.query.value=="")
	{
	alert("Please Enter Value for Query Field");
	document.form.query.focus();
	return false;
	}
	return true;
	}
	function isEmail (emailIn){
	var isEmailOk = false;
	//var filter = /^[a-zA-Z0-9][a-zA-Z0-9._-]*\@[a-zA-Z0-9-]+(\.[a-zA-Z][a-zA-Z-]+)+$/
	var filter = /^(([^<>()[\]\\.,;:\s@\”]+(\.[^<>()[\]\\.,;:\s@\”]+)*)|(\”.+\”))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/
	if(emailIn.search(filter) != -1)
	isEmailOk = true;
	if(emailIn.indexOf("..") != -1)
	isEmailOk = false;
	if(emailIn.indexOf(".@") != -1)
	isEmailOk = false;
	return isEmailOk;
	}
	//-->
	</script>