// JavaScript Document//<![CDATA[
	function ref (elstringid) {
		if (document.all) return document.all[elstringid]; 
		else
		if (document.getElementById) return document.getElementById(elstringid);
	}

	function calc1() {
		if (ref("length").value <= 0)
			ref("length").value='0';
		ref("payment").value=Math.round(((ref("mortage_value").value*(ref("interest_rate_value").value/1200))/(1-(Math.pow((1/(1+(ref("interest_rate_value").value/1200))),(ref("length").value*12))))));
		if (isNaN(ref("payment").value))
			ref("payment").value='0';
	}
	function calc2() {
		if (ref("mortage").value <= 0)
			ref("mortage").value='0';
		var str;
		str = ref("mortage").value;
		ref("mortage_value").value = str.replace(",",".");
		ref("payment").value=Math.round(((ref("mortage_value").value*(ref("interest_rate_value").value/1200))/(1-(Math.pow((1/(1+(ref("interest_rate_value").value/1200))),(ref("length").value*12))))));
		if (isNaN(ref("payment").value))
			ref("payment").value='0';
	}
	function calc3() {
		if (ref("interest_rate").value <= 0)
			ref("interest_rate").value='0';
		var str;
		str = ref("interest_rate").value;
		ref("interest_rate_value").value = str.replace(",","."); 
		ref("payment").value=Math.round(((ref("mortage_value").value*(ref("interest_rate_value").value/1200))/(1-(Math.pow((1/(1+(ref("interest_rate_value").value/1200))),(ref("length").value*12))))));
		if (isNaN(ref("payment").value))
			ref("payment").value='0';
	}
//]]>