function validate_form()
{
    valid = true;

    if ( document.form.FirstName.value == "")
    {
        alert ( "Please supply your first name" );
        valid = false;
		document.form.FirstName.focus();
    }
	
	if (document.form.LastName.value == "")
	{
		alert("Please supply your last name");
		valid=false;
		document.form.LastName.focus();
	}
	
	if (document.form.PractiseName.value == "")
	{
		alert("Please supply your practise name");
		valid=false;
		document.form.PractiseName.focus();
	}
	
	if (document.form.PostalAddress.value == "")
	{
		alert("Please supply your postal address");
		valid=false;
		document.form.PostalAddress.focus();
	}
	
	var emailID = document.form.EmailAddress
	
	if ((emailID.value==null)||(emailID.value==""))
	{
		alert("Please supply your email address");
		valid=false;
		document.form.EmailAddress.focus();
		
	}
	
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	return true
	
    return valid;
}

function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail Address")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail Address")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail Address")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail Address")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail Address")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail Address")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail Address")
		    return false
		 }

 		 return true					
	}