//function that will validate the post code entered in the text box
function validate():Boolean {
	//read in text
	postCode = pc.text;
	//change to lower case
	test = postCode.toLowerCase();
	//clear array
	a = new Array();
	b = new Array();
	c = new Array();
	
	//split the string up and put in an array
	for (i=0; i<test.length; i++) {
		a[i] = test.substr(i, 1);
	}

	//identify any white space and remove
	for (i=0; i<test.length; i++) {
		if (a[i] == " ") {
			a.splice(i,1);
		}
	}

	//identify whether the characters are letters or numbers
	for (i=0; i<a.length; i++) {
		if (isNaN(a[i]) == false) {
			b[i] = "N";
		} else {
			b[i] = "A";
		}
	}

	//change the array elements into a string that we can use to compare against know possible post code formats
	for (i=0; i<b.length; i++) {
		if (i != 0) {
			c = c+b[i];
		} else {
			c = b[i];
		}
	}

	if (c == "ANNAA") {
		//check first character - cannot be Q V or X
		if (a[0] == "q" || a[0] == "v" || a[0] == "x") {
			return false;
		}
		//check penultimate character - cannot be C, I, K, M, O or V 
		if (a[3] == "c" || a[3] == "i" || a[3] == "k" || a[3] == "m" || a[3] == "o" || a[3] == "v") {
			return false;
		}
		//check last character - cannot be C, I, K, M, O or V 
		if (a[4] == "c" || a[4] == "i" || a[4] == "k" || a[4] == "m" || a[4] == "o" || a[4] == "v") {
			return false;
		}
	} else if (c == "ANNNAA") {
		//check first character - cannot be Q V or X
		if (a[0] == "q" || a[0] == "v" || a[0] == "x") {
			return false;
		}
		//check penultimate character - cannot be C, I, K, M, O or V 
		if (a[4] == "c" || a[4] == "i" || a[4] == "k" || a[4] == "m" || a[4] == "o" || a[4] == "v") {
			return false;
		}
		//check last character - cannot be C, I, K, M, O or V 
		if (a[5] == "c" || a[5] == "i" || a[5] == "k" || a[5] == "m" || a[5] == "o" || a[5] == "v") {
			return false;
		}
	} else if (c == "AANNAA") {
		//check first character - cannot be Q V or X
		if (a[0] == "q" || a[0] == "v" || a[0] == "x") {
			return false;
		}
		//check second character - cannot be I J or Z 
		if (a[1] == "i" || a[1] == "j" || a[1] == "z") {
			return false;
		}
		//check penultimate character - cannot be C, I, K, M, O or V 
		if (a[4] == "c" || a[4] == "i" || a[4] == "k" || a[4] == "m" || a[4] == "o" || a[4] == "v") {
			return false;
		}
		//check last character - cannot be C, I, K, M, O or V 
		if (a[5] == "c" || a[5] == "i" || a[5] == "k" || a[5] == "m" || a[5] == "o" || a[5] == "v") {
			return false;
		}
	} else if (c == "AANNNAA") {
		//check first character - cannot be Q V or X
		if (a[0] == "q" || a[0] == "v" || a[0] == "x") {
			return false;
		}
		//check second character - cannot be I J or Z 
		if (a[1] == "i" || a[1] == "j" || a[1] == "z") {
			return false;
		}
		//check penultimate character - cannot be C, I, K, M, O or V 
		if (a[5] == "c" || a[5] == "i" || a[5] == "k" || a[5] == "m" || a[5] == "o" || a[5] == "v") {
			return false;
		}
		//check last character - cannot be C, I, K, M, O or V 
		if (a[6] == "c" || a[6] == "i" || a[6] == "k" || a[6] == "m" || a[6] == "o" || a[6] == "v") {
			return false;
		}
	} else if (c == "ANANAA") {
		//check first character - cannot be Q V or X
		if (a[0] == "q" || a[0] == "v" || a[0] == "x") {
			return false;
		}
		//check third character - can only be A, B, C, D, E, F, G, H, J, K, S, T, U or W 
		if (a[2] == "a" || a[2] == "b" || a[2] == "c" || a[2] == "d" || a[2] == "e" || a[2] == "f" || a[2] == "g" || a[2] == "h" || a[2] == "j" || a[2] == "k" || a[2] == "s" || a[2] == "t" || a[2] == "u" || a[2] == "w") {
		} else {
			return false;
		}
		//check penultimate character - cannot be C, I, K, M, O or V
		if (a[4] == "c" || a[4] == "i" || a[4] == "k" || a[4] == "m" || a[4] == "o" || a[4] == "v") {
			return false;
		}
		//check last character - cannot be C, I, K, M, O or V 
		if (a[5] == "c" || a[5] == "i" || a[5] == "k" || a[5] == "m" || a[5] == "o" || a[5] == "v") {
			return false;
		}
	} else if (c == "AANANAA") {
		//check first character - cannot be Q V or X
		if (a[0] == "q" || a[0] == "v" || a[0] == "x") {
			return false;
		}
		//check second character - cannot be I J or Z 
		if (a[1] == "i" || a[1] == "j" || a[1] == "z") {
			return false;
		}
		//check fourth character - can only be A, B, E, H, M, N, P, R, V, W, X or Y 
		if (a[3] == "a" || a[3] == "b" || a[3] == "e" || a[3] == "h" || a[3] == "m" || a[3] == "n" || a[3] == "p" || a[3] == "r" || a[3] == "v" || a[3] == "w" || a[3] == "x" || a[3] == "y") {
		} else {
			return false;
		}
		//check penultimate character - cannot be C, I, K, M, O or V
		if (a[5] == "c" || a[5] == "i" || a[5] == "k" || a[5] == "m" || a[5] == "o" || a[5] == "v") {
			return false;
		}
		//check last character - cannot be C, I, K, M, O or V 
		if (a[6] == "c" || a[6] == "i" || a[6] == "k" || a[6] == "m" || a[6] == "o" || a[6] == "v") {
			return false;
		}
	} else if (c == "AAANAA") {
		if (a[0] == "g" && a[1] == "i" && a[2] == "r" && a[3] == "0" && a[4] == "a" && a[5] == "a") {
		} else {
			return false;
		}
	} else {
		return false;
	}
}