// JavaScript Document
function calcula() 
{	
	var preco_u,quant,total=0;	
	preco_u=document.getElementById("preco_prod").value;
	quant=document.getElementById("qtd").value;
	total=eval(roundit(eval(preco_u*quant),2));	
	document.getElementById("total").innerHTML=total + " €";
}
function roundit(Num, Places)
{
	if (Places > 0)	
	{
		if ((Num.toString().length - Num.toString().lastIndexOf('.')) > (Places + 1))
		return Math.round(Num * (Math.pow(10, Places))) / (Math.pow(10, Places));
		else return Num;
	}
	else return Math.round(Num);
}
function SwitchMenu(obj)
{
  if(document.getElementById)
	{
    var el = document.getElementById(obj);
    
    var obj2 = obj + "b";
    var el2 = document.getElementById(obj2);
    
    var obj3 = obj + "a";
    var el3 = document.getElementById(obj3);
    
    var ar = document.getElementById("masterdiv").getElementsByTagName("span");
    if(el.style.display != "block")
		{
			el.style.display = "block";
			el2.style.display = "block";
			el3.style.display = "none";
		}
		else
		{
			el.style.display = "none";
			el2.style.display = "none";
			el3.style.display = "block";
		}
	}
}