function FormatNumber(expr,decplaces)
{
var str ="" + Math.round(eval(expr) * Math.pow(10,decplaces));
while (str.length <= decplaces)
{
str = "0" + str;
}
var decpoint = str.length - decplaces;
return str.substring(0,decpoint)+"."+str.substring (decpoint, str.length);
}


        function get_selected(object){
                for (var i = 0; i < object.length; i++) {
                        if (object[i].selected) return(object[i].value);
                }
        }
        function set_selected(object, t_value){
                for (var i = 0; i < object.length; i++) {
                        if (object[i].value==t_value) object[i].selected="TRUE";
                }
        }
        function changeAdvance() {
                document.main_filter.LEASING_ADVANCE.value=document.main_filter.LEASING_ADVANCE_SUM.value/document.main_filter.ARTICLE_PRICE.value * 100;
                change();
        }
        function changeAdvanceSum() {
                document.main_filter.LEASING_ADVANCE_SUM.value=document.main_filter.ARTICLE_PRICE.value*document.main_filter.LEASING_ADVANCE.value / 100;
                change();
        }
        function change() {
                document.main_filter.LEASING_ADVANCE_SUM.value=document.main_filter.ARTICLE_PRICE.value*document.main_filter.LEASING_ADVANCE.value / 100;
				
                document.main_filter.MONTH_PAYMENT.value= FormatNumber((Math.round((((document.main_filter.LEASING_INTEREST.value / 100 / 12) *
				((document.main_filter.ARTICLE_PRICE.value - document.main_filter.LEASING_ADVANCE_SUM.value)-
			   ((document.main_filter.ARTICLE_PRICE.value * document.main_filter.LEASING_RESIDUALVALUE.value / 100) /
			    (Math.pow((document.main_filter.LEASING_INTEREST.value / 100 / 12) + 1, get_selected(document.main_filter.LEASING_PERIOD))))) /
				(1 - (1 / Math.pow((document.main_filter.LEASING_INTEREST.value / 100 / 12) + 1, get_selected(document.main_filter.LEASING_PERIOD))))))*100)/100),2);
	    }
        function examination() {
                if(document.main_filter.ARTICLE_PRICE.value == "" || isNaN(document.main_filter.ARTICLE_PRICE.value)){
                        alert("Āāåäčņå ńņīčģīńņü īįśåźņą!");
                        document.main_filter.ARTICLE_PRICE.focus();
                        return(false);
                }
                if(document.main_filter.ARTICLE_NAME.value == ""){
                        alert("Āāåäčņå īļčńąķčå īįśåźņą!");
                        document.main_filter.ARTICLE_NAME.focus();
                        return(false);
                }
        }