function ao(c,txt,val,idx){
	c.options[idx] = new Option(txt,val);
}
function setSizes(c, s){
	var id;
	var x=0;
	var opt;
	if (!s || !c)
		return;
	if (c.selectedIndex < 1){
		clearSizes();
		return;
	}
	id = c.options[c.selectedIndex].value;
	s.options.length = 0;
	opt = new Option('Please select a size', '');
	s.options[x++] = opt;
	switch(id){
	
		
		    case "ALL ALUMINUM":
		  
		    ao(s, "NB1015ADLX-15' LONG (82 SEATS) - $5813.49","NB1015ADLX-15' LONG (82 SEATS)", x++);
		  
		    ao(s, "NB1021ADLX-21' LONG (113 SEATS) - $6841.99","NB1021ADLX-21' LONG (113 SEATS)", x++);
		  
		    ao(s, "NB1024ADLX-24' LONG (133 SEATS) - $7809.99","NB1024ADLX-24' LONG (133 SEATS)", x++);
		  
		    ao(s, "NB1027ADLX-27' LONG (144 SEATS) - $8387.49","NB1027ADLX-27' LONG (144 SEATS)", x++);
		  
		    break;
		  
	  
		
		    case "Galv. Frame/Alum. Planks":
		  
		    ao(s, "NB1015GDLX-15' LONG (82 SEATS) - $6022.49","NB1015GDLX-15' LONG (82 SEATS)", x++);
		  
		    ao(s, "NB1021GDLX-21' LONG (113 SEATS) - $7067.49","NB1021GDLX-21' LONG (113 SEATS)", x++);
		  
		    ao(s, "NB1024GDLX-24' LONG (133 SEATS) - $8090.49","NB1024GDLX-24' LONG (133 SEATS)", x++);
		  
		    ao(s, "NB1027GDLX-27' LONG (144 SEATS) - $8667.99","NB1027GDLX-27' LONG (144 SEATS)", x++);
		  
		    break;
		  
	  
	}
}

function initSizes (){
	var s, c, f=document.frmOrder;
	
	if ( !f )
		return;
			
	s = f.sizes;
	c = f.colors;
	if (!c || !s)
		return;
	if (c.selectedIndex > 0){
		setSizes(c, s);
	} else {		
		s.options.length = 0;
		var opt = new Option('Please select a color first', '');
		s.options[0] = opt;
	}
}
function clearSizes (){
	var s, c, f=document.frmOrder;
	
	if ( !f )
		return;
	
	s = f.sizes;
	c = f.colors;
	if (!c || !s)
		return;
	if (c.selectedIndex > 0)
		return;
	s.options.length = 0;
	var opt = new Option('Please select a color first', '');
	s.options[0] = opt;
}
window.onload = initSizes;