function validate(){
	if(document.form2.os0.value=="choose color"){
	alert('Please Choose Color');
	  document.form2.os0.focus();
	  return false;
	 }
	if(document.form2.quantity.value=="Quantity"){
	alert('Please fill Quantity');
	  document.form2.quantity.focus();
	  return false;
	 }
	 
	
if(document.form2.quantity.value=="1"){
	
	document.form2.shipping.value="10";
	document.form2.tax.value="4.3";
  }
 else if (document.form2.quantity.value=="2"){
	 document.form2.shipping.value="10"
	 document.form2.tax.value="8.6";
 }
 else if (document.form2.quantity.value=="3"){
	 document.form2.shipping.value="12"
	 document.form2.tax.value="12.9";
 }
  }
  

	  
function chk_product()
{
	if (document.form2.os0.selectedIndex==1)
		{
		alert("Sorry Out of Stock");
		
		document.form2.os0.selectedIndex=0;
		}
	else if (document.form2.os0.selectedIndex==2)
		{
		alert("Sorry Out of Stock");
		document.form2.os0.selectedIndex=0;
		
		}		
}