function display_err(p, msg) {
	
	document.getElementById(p).style.border = '1px solid #6A0A0A';
	document.getElementById('v_'+p).innerHTML = ''+msg+'';
	
}

function rem_err(p) {
	document.getElementById(p).style.border = '';
	document.getElementById('v_'+p).innerHTML = '';
}

function validate(p, m1, msg1, m2, msg2) {
	
	var i = document.getElementById(p);
	
	/* Validate if required field is empty */
	if(m1 == 'req' && m2 == 'num') {
		if(i.value == '') {
			display_err(p, msg1);
		}
		else if(i.value != '') {
			rem_err(p);
			
			if(isNaN(i.value)) {
				display_err(p, msg2);
			}
			else {
				rem_err(p);
			}
		}
	}
	
	else if(m1 == 'req' && m2 == 'numB0') {
		if(i.value == '') {
			display_err(p, msg1);
		}
		else if(i.value != '' || i.value <= 0) {
			rem_err(p);
			
			if(isNaN(i.value)) {
				display_err(p, msg2);
			}
			else {
				rem_err(p);
			}
		}
	}
	
	else if(m1 == 'req') {
		if(i.value == '') {		
			display_err(p, msg1);
		}
		else {
			rem_err(p);
		}
	}
	else if(m2 == 'req') {
		if(i.value == '') {
			display_err(p, msg2);
		}
		else {
			rem_err(p);
		}
	}
	
	
	
	/* Validate if entered value is a number. 
			if(m1 == 'num') {
		if(isNaN(i.value)) {
			display_err(p, msg1);
		}
		else {
			rem_err(p);
		}
	}
	else if(m2 == 'num' ) {
		if(isNaN(i.value)) {
			display_err(p, msg2);
		}
		else {
			rem_err(p);
		}
	}*/

	
	
}