var fontSize=11;
function increaseSize()
{
	if (fontSize < 16) 
	{
		fontSize += 1;setSize();
	}
}
function decreaseSize()
{
	if (fontSize > 9) 
	{
		fontSize -= 1;setSize();
	}
}
function setSize() 
{
	var i;
	var elementCount;
	elementCount = document.getElementsByTagName('div').length;
	for (i=0; i<elementCount; i++)
	{
		if (document.getElementsByTagName('div')[i].id == 'fontContent') 
		{
			document.getElementsByTagName('div')[i].style.fontSize=fontSize+'px';
		}
	}
}

function validateBodyMass() {
	var weight = document.getElementById('weight').value
	var height = document.getElementById('height').value 

	if ((isNaN(weight)) || (weight=='') || (weight<1) || (weight>250)) {
		document.getElementById('mass_result').innerHTML='Το βάρος σας δεν είναι έγκυρο';
	}
	else if (isNaN(height) || height<10 || height>250) {
		document.getElementById('mass_result').innerHTML='Το ύψος σας δεν είναι έγκυρο';
	}
	else {
		calculateBMI();
	}
}

function  calculateBMI() {
  var weight = eval(document.getElementById('weight').value)
  var height = eval(document.getElementById('height').value)
  var height2 = height / 100
  var BMI = weight  / (height2 * height2)
	//document.getElementById('mass_result').innerHTML='Δείκτης : ' + custRound(BMI,1);
	document.getElementById('mass_index').value= custRound(BMI,1);
	document.mass_frm.submit();
}
function custRound(x,places) {
  return (Math.round(x*Math.pow(10,places)))/Math.pow(10,places)
}