// Po vybrani kurzu se skryje pulldown s textem "Select cours first" 
// + zobrazi se polldown podle vybraneho kurzu		
function zobrazLocation(sel){	

			
			var plsSel = document.getElementById('qLocation');		
			var skiSel = document.getElementById('qSki');
			var sunSel = document.getElementById('qSun');
//			var compSel = document.getElementById('qComp');
					
			sunSel.style.display    = "none";			
			skiSel.style.display     = "none";
//			compSel.style.display    = "none";	
			
			// Nevybran zadny kurz (Please select)
			if(sel.options[0].selected){			
				plsSel.style.display    = "block";	
			}
			// Vybrán Sun
			if(sel.options[1].selected){			
				plsSel.style.display    = "none";	
				sunSel.style.display    = "block";	
			}
			// Vybrán Ski	
			else if(sel.options[2].selected){	
				plsSel.style.display    = "none";		
				skiSel.style.display     = "block";
			}
			// Vybrány pocitace 
//			else if(sel.options[3].selected){		
//				plsSel.style.display    = "none";		
//				compSel.style.display    = "block";
//			}
	
}	

function check(reg) {
	
	var course = reg.idsites;	
	var skiSel = reg.idresortsSki;
	var sunSel =  reg.idresortsSun;
	
	if(course.options[0].selected){ 
			// nevybral zadny kurz
			alert("Please select course");
			course.focus();
			return false;
	}
	if(skiSel.options[0].selected && sunSel.options[0].selected){
			// nevybral lokaci
			alert("Please select location");
			return false;
	}		
	if( course.options[1].selected && sunSel.options[0].selected) {
			// vybral sun, ale nevybral lokaci
			alert("Please select location");
			sunSel.focus();
			return false;
	}		
	if( course.options[2].selected && skiSel.options[0].selected) {
			// vybral ski, ale nevybral lokaci
			alert("Please select location");
			skiSel.focus();
			return false;
	}		
	return true;
	
}