function checkcart(form)
{
	var invalid=0;
	var i;
	var formElements = form.elements;
	for (i=0; i<formElements.length; i++) 
	{
	     if (formElements[i].type=="select-one") 
	     {  
	          var element=formElements[i].selectedIndex;
	          var text=formElements[i].options[element].text;
	          if(text=="Please select")
	          {
	        	  invalid=1;
	          }
	     }
	}
	
	if(invalid==1)
	{
		alert("Please choose all required options for this product");
		return false;
	}
	else
	{
		return true;
	}
}