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 "Galv. Steel Under/Anodized Alum. Planks":
		  
		    ao(s, "NB0515GPRF-15' LONG (50 SEATS) - $2304.49","NB0515GPRF-15' LONG (50 SEATS)", x++);
		  
		    ao(s, "NB0515GSTD-15' LONG (50 SEATS) - $2177.99","NB0515GSTD-15' LONG (50 SEATS)", x++);
		  
		    ao(s, "NB0521GPRF-21' LONG (70 SEATS) - $2975.49","NB0521GPRF-21' LONG (70 SEATS)", x++);
		  
		    ao(s, "NB0521GSTD-21' LONG (70 SEATS) - $2799.49","NB0521GSTD-21' LONG (70 SEATS)", x++);
		  
		    ao(s, "NB0524GPRF-24'LONG(80 SEATS) - $3404.49","NB0524GPRF-24'LONG(80 SEATS)", x++);
		  
		    ao(s, "NB0524GSTD-24' LONG (80 SEATS) - $3200.99","NB0524GSTD-24' LONG (80 SEATS)", x++);
		  
		    ao(s, "NB0527GPRF-27'LONG(90 SEATS) - $3701.49","NB0527GPRF-27'LONG(90 SEATS)", x++);
		  
		    ao(s, "NB0527GSTD-27' LONG (90 SEATS) - $3464.99","NB0527GSTD-27' LONG (90 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;