$(document).ready(function(){
 	
	// beregn
	$("#beregn").click(function(){
		var h = document.getElementById('height').value;
		var w = document.getElementById('weight').value;
		var bmi = 0;
	
		h = h / 100;
		
		bmi = w / Math.pow(h,2);
		bmi = roundNumber(bmi,1);
		$(".res").html(bmi); 
		
	
	});
	
	//reset
	$("#reset").click(function(){
		document.getElementById('height').value = "";
		document.getElementById('weight').value = "";
		$(".res").html(""); 
	});
	
	
	function roundNumber(rnum, rlength) {
		var newnumber = Math.round(rnum*Math.pow(10,rlength))/Math.pow(10,rlength);
		return newnumber; 
	}
					
});