function getRealNumber(value) {
	var charpos = value.search("[^0-9]");
	if(value.length > 0 && charpos >= 0) {
/*
		if(!strError || strError.length ==0) {
			strError = objValue.name+": Only digits allowed ";
		}
		alert(strError + "\n [Error character position " + eval(charpos+1)+"]"); 
*/
		return 0;
	}
	return value;
}

function updateElement(id,value) {
	var item = document.getElementById(id);
	if (item) {
		item.value = value;
	}
}

function multiplyElement(id1,id2,iddst) {
	var result;

	var item = document.getElementById(id1);

	if (item) {
		result = getRealNumber(item.value);
		item = document.getElementById(id2);
		if (item) {
			result *= item.value;
		}
	}
	result = Math.floor(result);
	updateElement(iddst,result);
}