function fcalc()
{
//alert("f_calc");
var plosh = new Number(document.getElementById("PloshDoma").value);
//alert("plosh = "+plosh);

var SechBrus = new Number(document.getElementById("SechBrus").value);
//alert("SechBrus = "+SechBrus);

var Fundament = (document.getElementById("Fundament").checked)?6630:0;
//alert("Fundament = "+Fundament);

var IngerSeti = (document.getElementById("IngerSeti").checked)?521:0;
//alert("IngerSeti = "+IngerSeti);

var ElectrichSeti = (document.getElementById("ElectrichSeti").checked)?920:0;
//alert("ElectrichSeti = "+ElectrichSeti);

var Etagi = new Number(document.getElementById("Etagi").value);
//alert("Etagi = "+Etagi);

document.getElementById("Itogo").innerHTML=plosh*(Fundament+IngerSeti+ElectrichSeti+Etagi);

}