var actTab = 't1';
function show(tab){
	if (actTab != tab){
		document.getElementById(actTab).style.display = "none";
		document.getElementById(tab).style.display = "block";
		document.getElementById("a"+actTab).className = "";
		document.getElementById("a"+tab).className = "act";		
		actTab=tab;
	}
 }
function calculate(){
	var i,j;
	var result = 0;	
	var result = 0;	
	var f = document.getElementById('calcForm');
	var tbls = f.getElementsByTagName('table');
	for(j=0;j<tbls.length;j++){
		var tbl = tbls[j];
		var trs = tbl.getElementsByTagName('tr');
		
		for(i=0;i<trs.length;i++){
		
			var tds = trs[i].getElementsByTagName('td');
			
			if(tds.length == 3){
				var	inps = tds[2].getElementsByTagName('input');
				var	count = 0;
				if (inps[0].value != ''){
					 count = parseInt(inps[0].value);
					 if (isNaN(count)){
					 	count = 0;
					 	inps[0].value = 0;
					 }
				}
				if (count != 0){
					var w=tds[1].innerHTML;
					if(w.indexOf('-') != -1){
						w = w.substring(w.indexOf('-')+1);
					}
					w = parseInt(w);			
					var	p = parseFloat(inps[1].value);
					result+=count*w*p;
				}
	
			}
		}
	}
	if (result > 0){
		result=result/1000;
	}
	document.getElementById('result').innerHTML = result;
}