function ValidateForm(){

	var dataToCheck=document.frmBooking.patientName

	if ((dataToCheck.value==null)||(dataToCheck.value=="")){
		alert("You must enter the patient's name.")
		dataToCheck.focus()
		return false
	}

	var dataToCheck=document.frmBooking.patientDOB

	if ((dataToCheck.value==null)||(dataToCheck.value=="")){
		alert("You must enter a date of birth for the patient.")
		dataToCheck.focus()
		return false
	}
	
	var dataToCheck=document.frmBooking.patientAddress

	if ((dataToCheck.value==null)||(dataToCheck.value=="")){
		alert("You must enter an address for the patient.")
		dataToCheck.focus()
		return false
	}

	var dataToCheck=document.frmBooking.doctorName

	if ((dataToCheck.value==null)||(dataToCheck.value=="")){
		alert("You must enter the name of the referring doctor.")
		dataToCheck.focus()
		return false
	}

	var dataToCheck=document.frmBooking.doctorRefDate

	if ((dataToCheck.value==null)||(dataToCheck.value=="")){
		alert("You must enter the date of the doctor's referral.")
		dataToCheck.focus()
		return false
	}

	var dataToCheck=document.frmBooking.doctorAddress

	if ((dataToCheck.value==null)||(dataToCheck.value=="")){
		alert("You must enter an address for the referring doctor.")
		dataToCheck.focus()
		return false
	}

	var dataToCheck=document.frmBooking.doctorPhone

	if ((dataToCheck.value==null)||(dataToCheck.value=="")){
		alert("You must enter a phone number for the referring doctor.")
		dataToCheck.focus()
		return false
	}

	var dataToCheck=document.frmBooking.doctorEmail
	var dataLength=dataToCheck.value.length;

	if (dataLength!=0){
		if (echeck(dataToCheck.value)==false){
		dataToCheck.value=""
		dataToCheck.focus()
		return false
		}
	}

	var dataToCheck=document.frmBooking.FILE1.value.toUpperCase();
	var dataLength=dataToCheck.length;
	if (dataLength!=0){
		if (dataToCheck.substr(dataLength-4,4)!='.DOC'){
			alert('You can only attach Microsoft Word documents to this booking form.');
			return false;
		}
	}

	ShowProgress();

	document.frmBooking.submit();
	return true
 }

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("The email address you have entered is in an invalid format.")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("The email address you have entered is in an invalid format.")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		   alert("The email address you have entered is in an invalid format.")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		   alert("The email address you have entered is in an invalid format.")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		   alert("The email address you have entered is in an invalid format.")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		   alert("The email address you have entered is in an invalid format.")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		   alert("The email address you have entered is in an invalid format.")
		    return false
		 }

 		 return true					
	}

 function checkCR(evt)
 {

    var evt  = (evt) ? evt : ((event) ? event : null);

    var node = (evt.target) ? evt.target : ((evt.srcElement) ? evt.srcElement : null);

    if ((evt.keyCode == 13) && (node.type=="text")) {return false;}

  }

  document.onkeypress = checkCR;