function calc(){
	if  (document.getElementById("x1").value != "" ){
		rez_exact = parseFloat(document.getElementById("x1").value) * parseFloat(document.getElementById("c1").value)/parseFloat(document.getElementById("c2").value);
		document.getElementById("rez").value = Math.round(rez_exact*100)/100;
		}
	else{
		document.getElementById("rez").value = "";
		}
}
function sterge(x)
{
	x.value="";
}
function verifica_email(f)
{
	var str;
	str=f.email.value;
	if(str.search("^([a-zA-Z0-9_]|\\-|\\.)+@(([a-zA-Z0-9_]|\\-)+\\.)+[a-zA-Z]{2,4}\$")==-1)
	{
	alert("Adresa dumneavoastra de email este incorecta");
	return false;
	}
}
function show_content(curent,total,id_caseta)
{
	for(i=1;i<=total;i++)
	{
		if(i==1) document.getElementById("clapeta_"+i+"_"+id_caseta).className = "first";
		else if(i==total) document.getElementById("clapeta_"+i+"_"+id_caseta).className = "last";
		else document.getElementById("clapeta_"+i+"_"+id_caseta).className = "";
		document.getElementById("content_"+i+"_"+id_caseta).style.display = "none";
	}
	if(curent==1 && total==1) document.getElementById("clapeta_"+curent+"_"+id_caseta).className = "first last selected";
	else if(curent==1) document.getElementById("clapeta_"+curent+"_"+id_caseta).className = "first selected";
	else if(curent==total) document.getElementById("clapeta_"+curent+"_"+id_caseta).className = "last selected";
	else document.getElementById("clapeta_"+curent+"_"+id_caseta).className = "selected";
	document.getElementById("content_"+curent+"_"+id_caseta).style.display = "";
}