//FUNCTION TO CHECK IF FIELD IS EMPTY
function isemp(field,message) {

if (field.value == "")

{

	alert("Please key in "+message)

	field.focus();

    	return false;

}



return true;

}


//--------------------------------------------------------------------------------------------------------
//FUNCTION TO CHECK IF FIELD IS EMPTY FOR (ADMINISTRATIVE QUESTIONS)
function isempquestion(field,message) {

if (field.value == "")

{

	alert("Please tell us "+message)

	field.focus();

    	return false;

}



return true;

}


//--------------------------------------------------------------------------------------------------------
//FUNCTION TO CHECK IF EMAIL IS VALID
function validemail(field) {



validRegExp = /^[^@]+@[^@]+.[a-z]{2,}$/i;



   // search email text for regular exp matches

    if (field.value.search(validRegExp) == -1)

   {

   	alert('Please key in a valid Email address.');

      	field.focus();

      	return false;

	

   }



return true;

}


//--------------------------------------------------------------------------------------------------------
//VALIDATE SELECTBOX
function isselect(field,message) {



if (field.selectedIndex <= 0)

{

	alert("Please select a "+message)

	field.focus();

    	return false;

}



return true;

}


//--------------------------------------------------------------------------------------------------------
//VALIDATE CHECKBOX
function ischeck(field,message)
{
	
	valid=false
	for(i=0;i<field.length;i++)
	{
		if(field[i].checked)
		{
			valid=true;
		}
	}

	if(!valid)
	{
		alert("Please select a "+message);
		field[0].focus();

		return false;
	}
	else
	{return true;}

}


//--------------------------------------------------------------------------------------------------------
//VALIDATE RADIO BUTTON
function isradio(field,message)
{
	var chosenradio = false;
	for (counterA = 0; counterA < field.length; counterA++)
	{
 		if (field[counterA].checked)
		 chosenradio = true;
 	}
 	if (!chosenradio)
 	{
		alert ("Please choose your "+message);
		field[0].focus();
 		return false;
 	}
 	else
	{
	return true;
	}

}


//--------------------------------------------------------------------------------------------------------
//VALIDATE PHONE NUMBER
function validtelephone()
{
	if (document.frmfeedback.contact.value == '')
	{
				alert("Please fill in your Contact Number")
				document.frmfeedback.contact.focus();
				return false;

	}

return true;

}




//--------------------------------------------------------------------------------------------------------
//FUNCTION THAT PERFORMS ALL FUNCTIONS, DEFINED IN THE ONSUBMIT EVENT HANDLER
function checksubmission(frmfeedback)

{

	if (isselect(document.frmfeedback.subject,"Subject of your enquiry"))
	{
		if (isemp(document.frmfeedback.name,"Name"))
	    {
		    if (validemail(document.frmfeedback.Email,"Email"))
		    {
			    if (isemp(document.frmfeedback.message,"Message"))
	    		{
			    	return true;
			    }
			}
		}
	}

return false;

}