// JavaScript Document
function checkForm()
{
	var cemail, cName, cRoad, cPostcode, cText, cContactName, cPhoneNo; 				/* ----------------------Add var for each field to be checked */
	with(window.document.msgform)
	{
		cemail   = email;		/* ----------------------set var to be form field */
		cName	= Name;
		cRoad	= Road;
		cPostcode = Postcode;
		cText = Text;
		cContactName = ContactName;
		cPhoneNo = phoneno;
		
	}
	 if(trim(cName.value) == '') /* --------------------Check for an empty field */
	{
		alert('Please enter your establishment name');
		cName.focus();
		return false;
	}
	else if(trim(cRoad.value) == '') /* --------------------Check for an empty field */
	{
		alert('Please enter road name');
		cRoad.focus();
		return false;
	}
	else if(trim(cPostcode.value) == '') /* --------------------Check for an empty field */
	{
		alert('Please enter postcode');
		cPostcode.focus();
		return false;
	}
	else if(trim(cText.value) == '') /* --------------------Check for an empty field */
	{
		alert('Please enter listing text');
		cText.focus();
		return false;
	}
	else if(trim(cContactName.value) == '') /* --------------------Check for an empty field */
	{
		alert('Please enter contact name');
		cContactName.focus();
		return false;
	}
	else if(trim(cemail.value) == '') /* --------------------Check for an empty field */
	{
		alert('Please enter your email address');
		cemail.focus();
		return false;
	}
	else if(!isEmail(trim(cemail.value)))
	{
		alert('Email address is not valid');
		cemail.focus();
		return false;
	}
	 else if(trim(cPhoneNo.value) == '') /* --------------------Check for an empty field */
	{
		alert('Please enter a phone number');
		cPhoneNo.focus();
		return false;
	}
	else
	{
		cname.value    = trim(cname.value);
		cRoad.value   = trim(cRoad.value);	
		cPostcode.value = trim(cPostcode.value);		
		cText.value = trim(cText.value);
		cContactName.value = trim(cContactName.value);
		cemail.value   = trim(cemail.value); /* ----------remove extra spaces in field values */
		cPhoneNo.value = trim(cPhoneNo.value);			
									
		return true;
	}
	
}

/*
Strip whitespace from the beginning and end of a string
Input : a string
*/
function trim(str)
{
	return str.replace(/^\s+|\s+$/g,'');
}

/*
Check if a string is in valid email format. 
Returns true if valid, false otherwise.
*/
function isEmail(str)
{
	var regex = /^[-_.a-z0-9]+@(([-_a-z0-9]+\.)+(ad|ae|aero|af|ag|ai|al|am|an|ao|aq|ar|arpa|as|at|au|aw|az|ba|bb|bd|be|bf|bg|bh|bi|biz|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|com|coop|cr|cs|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|edu|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gh|gi|gl|gm|gn|gov|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|in|info|int|io|iq|ir|is|it|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|mg|mh|mil|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|museum|mv|mw|mx|my|mz|na|name|nc|ne|net|nf|ng|ni|nl|no|np|nr|nt|nu|nz|om|org|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|pro|ps|pt|pw|py|qa|re|ro|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|um|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)|(([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5])\.){3}([0-9][0-9]?|[0-1][0-9][0-9]|[2][0-4][0-9]|[2][5][0-5]))$/i;
	return regex.test(str);
}