function calc(row)
	{
		var sum = 0;
		var fields_on_row=4;
		if(document.forms[0].elements[row*fields_on_row].value =="")
		{
			document.forms[0].elements[row*fields_on_row].value = 0;
		}
		
		if(!(document.forms[0].elements[row*fields_on_row].value >= 0))
		{
			document.forms[0].elements[row*fields_on_row].value = 0;
			alert("Inget giltigt värde");
		}
		
		sum = parseInt(document.forms[0].elements[row*fields_on_row+3].value) * parseInt(document.forms[0].elements[row*fields_on_row].value);
		document.forms[0].elements[row*fields_on_row+1].value=sum;
		totsum();
	}
	
	function totsum()
	{
		var sum_pos=document.forms[0].elements.length-6;
		document.forms[0].elements[sum_pos].value =0;
		document.forms[0].elements[sum_pos+1].value = 0;
		document.forms[0].elements[sum_pos+2].value = 0;
		
		
			var totsum = 0;
			var temp =0;
			
			for(var i=0; i<( (document.forms[0].elements.length)-6 ); i+=4)
			{
				if(document.forms[0].elements[i+1].value =="")
				{
					temp = 0;
				}
				else
				{
					temp = parseInt(document.forms[0].elements[i+1].value);
				}
				totsum =  totsum + temp ;
			}
			var sum_pos=document.forms[0].elements.length-6;
			document.forms[0].elements[sum_pos].value = totsum;
			document.forms[0].elements[sum_pos+1].value = totsum*0.25;
			document.forms[0].elements[sum_pos+2].value = totsum*1.25;
	}