function null_add(t_v)
{
t_v=t_v + "";
if(t_v.substring(t_v.length - 2,t_v.length-1)==".") t_v=t_v + "0";
else
	{
	if(t_v.substring(t_v.length - 3,t_v.length-2)!=".") t_v=t_v + ".00";
	}
return t_v;
}

function pereschet_total(val,znak)
{
if(znak=="+") t_v=parseFloat(document.basket.price_total.value)+parseFloat(val);
if(znak=="-") t_v=parseFloat(basket.price_total.value)-parseFloat(val);
if(znak=="") 
{
t_v=parseFloat(basket.price_total.value)+parseFloat(val);
}
t_v=Math.round(t_v*100)/100;
basket.price_total.value=t_v;
}

function pereschet(tt,obg,numb)
{
eval('t_v=tt.value*basket.'+obg+'_am_'+numb+'.value');
t_v=Math.round(t_v*100)/100;
t_v=t_v + "";
//t_v=null_add(t_v);
eval('basket.'+obg+'_sum_'+numb+'.value=t_v');
document.basket.target="basket_frame";
document.basket.submit();
}


function change_price(obg,todo,numb)
{
tt=document.getElementById(obg+'_'+numb);
tt_fin=document.getElementById(obg+'_fin_'+numb);
am_tt=document.getElementById(obg+'_am_'+numb);
if(todo=="+") 
	{ eval (tt.value ++); eval (tt_fin.value ++); pereschet_total(am_tt.value,"+"); pereschet(tt,obg,numb); }
if(todo=="-" && tt.value>0) 
	{ eval (tt.value --); eval (tt_fin.value --); pereschet_total(eval('basket.'+obg+'_am_'+numb+'.value'),"-"); pereschet(tt,obg,numb); }
if(todo=="") 
	{ eval (tt.value); 
	razn_val=(tt.value-tt_fin.value)*am_tt.value; 
	eval (tt_fin.value=tt.value); pereschet_total(razn_val,""); pereschet(tt,obg,numb); }

}