function validate_form()
{
valid = true;	

//Loopa igenom radionbuttons
var radio_choice = false;
for (counter = 0; counter < myform.typ.length; counter++)
{
if (myform.typ[counter].checked)
radio_choice = true; 
}
	
	 if (!radio_choice)
       {
            alert ( "Du måste välja betalningstyp");
             valid = false;
       }	   
	else if ((myform.kundnr.value=="") && (valid == true))
		{
	     alert ( "Du måste fylla i kundnummer" );
		 valid = false;
	   }
	else if ((myform.refno.value=="") || (isNaN(myform.refno.value)) || (myform.refno.value.length!=4) && (valid == true))
       {
            alert ( "Best. Nr stämmer inte" );
             valid = false;
	   }
	else if ((myform.summa.value=="") || (isNaN(myform.summa.value)) && (valid == true))
       {
            alert ( "Priset måste fyllas i och vara i kr." );
             valid = false;
       } 
	 else if ( (myform.Comment.value == "")  && (valid == true))
       {
            alert ( "Du måste fylla i ditt namn" );
             valid = false;
       }	   
        return valid;
}

function refreshImages(){
var search="?"+(new Date()).getTime();
for(var i=0;i<document.images.length;document.images[i++].src+=search);
}

var sWidth = screen.width;
sWidth=(sWidth/2)-350;
function winPopUp(filename) {
msgWindows=window.open(filename, "","top=150,left=" + sWidth + ",resizable=yes,scrollbars=no,width=350,height=420");
}
function winPopUploop(filename) {
msgWindows=window.open(filename, "","top=150,left=" + sWidth + ",resizable=yes,scrollbars=no,width=600,height=400");
}
/*använd vid utskrift fönster
function winPopUpprint(filename) {
msgWindows=window.open(filename, "","top=150,left=" + sWidth + ",resizable=yes,scrollbars=yes,width=700,height=600");
            }
*/