function calculate()
{
	if(document.getElementById("dc").value=="")
	{
			alert("Tolong inputkan hari pertama haid terakhir");
			document.getElementById("dc").focus();
			return false;
	}
today=document.getElementById("dc").value.split("-");
//date_fer=new Date(today[2],today[1],today[0]);

		one_day = 86400000;
		calc = ((Date.parse(today[1]+" "+today[0]+","+today[2])+ (one_day * document.getElementById("sm").value)) - (14 *one_day));
		masa_subur = calc - (4*one_day);
		hingga =  calc + (2*one_day);
		m_s  	=  new Date(masa_subur);		
		strm_s=m_s.toLocaleString();
		strm_s=strm_s.replace("12:00:00","");
		strm_s=strm_s.replace("00:00:00","");
		strm_s=strm_s.replace("AM","");
		strm_s=strm_s.replace("PM","");

		m_s_h 	=  new Date(hingga);
		strm_s_h=m_s_h.toLocaleString();
		strm_s_h=strm_s_h.replace("12:00:00","");
		strm_s_h=strm_s_h.replace("00:00:00","");
		strm_s_h=strm_s_h.replace("AM","");
		strm_s_h=strm_s_h.replace("PM","");

		
//alert(strm_s);

		document.getElementById("icon").bgColor="#74B71B";
		document.getElementById("hasil").innerHTML='<b><font color="#737373" size="2">Result</font></b>';
		document.getElementById("hasil").bgColor="#FFFFFF";
		document.getElementById("fert_from").innerHTML="<font size=2>Fertility Starts(from):"+strm_s+"</font>";
		document.getElementById("fert_to").innerHTML="<font size=2>(until)"+strm_s_h+"</font>";

}