// JavaScript Document
function expand(name) {
	document.getElementById( name ).style.display = "block";
}



function collapse(name) {
	document.getElementById( name ).style.display = "none";
}



function change_color(box_id, box_bg, box_color, lbl_id, lbl_color) {
	document.getElementById(lbl_id).style.color 			= lbl_color;
	document.getElementById(box_id).style.color 			= box_color;
	document.getElementById(box_id).style.backgroundColor 	= box_bg;
}



function MM_jumpMenu(targ,selObj,restore){ //v3.0
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
  if (restore) selObj.selectedIndex=0;
}



function preview_image(url, text){
	document.photo_img.src 								= url;
	document.getElementById("photo_text").innerHTML 	= text;
}



function formatCurrency(num) {

	num = num.toString().replace(/\$|\,/g,'');
	if(isNaN(num))
	num = "0";

	sign = (num == (num = Math.abs(num)));
	num = Math.floor(num*100+0.50000000001);
	cents = num%100;
	num = Math.floor(num/100).toString();
	
	if(cents<10)
	cents = "0" + cents;
	for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++)
	num = num.substring(0,num.length-(4*i+3))+','+
	num.substring(num.length-(4*i+3));
	
	return (num + '.' + cents);
	
}



function format_number(val) {

	val	= val.replace(/,/g , "");
	return parseFloat(val); 

}



function calculate_mortgage(form) {

	var amount 	= format_number(form.loan_price.value);
	var amount2	= format_number(form.loan_price.value);
	var down 	= format_number(form.loan_down.value);
	var rate 	= format_number(form.loan_interest.value) / 100;
	var term 	= format_number(form.loan_years.value) * 12;
	var payment = 0;
	
	amount		= amount - down;
	payment 	= amount * (rate / 12) / (1 - Math.pow ((1 + rate/12), -term));
	payment 	= Math.round (100 * payment) / 100;
	
	form.loan_price.value 	= formatCurrency(amount2);
	form.loan_down.value 	= formatCurrency(down);
	form.loan_monthly.value = formatCurrency(payment);
	
}