function checkValue(inp,openHours,maxHours,doneHours, currentHours, theTitle, theForm)
{
	if(currentHours == '')
	{
		currentHours=0;
	}
	if(inp.value <= maxHours)
	{

	}
	else
	{
		alert('U kunt voor '+theTitle+' niet meer dan het maximum van '+maxHours+' minuten invoeren');
		inp.value=maxHours;
		theForm.submit();
	}
}
function selectAll(what, val)
{
	var x = document.getElementsByTagName('INPUT');
	for (var i=0;i<x.length;i++) 
	{
		if(x[i].id.indexOf(what)!=-1)
		{
			x[i].checked = val.checked;
		}
	}
}
function calculate(eID, theInput, deelnemer){
	if(theInput=='m')
	{
		if(document.getElementById('task_min_'+eID).value>0)
		{
			document.getElementById('task_hours_'+eID).value = parseFloat(document.getElementById('task_min_'+eID).value / 60).toFixed(2);
		}
	}
	else 
	{
		if(document.getElementById('task_hours_'+eID).value>0)	
		{
			document.getElementById('task_min_'+eID).value = parseFloat(document.getElementById('task_hours_'+eID).value * 60).toFixed(0);
		}
	}
	if(document.getElementById('task_hours_'+eID).value != '')
	{
		if(deelnemer == '1')
		{
			if(document.getElementById('task_deelnemer_'+eID).selectedIndex == '0' )
			{
//				alert('SelectedIndex is nul, dus geen leerling. Let op mag form niet versturen - has_deelnemer_'+eID);
				document.getElementById('has_deelnemer_'+eID).value = '1';
			}
			else 
			{
//				alert('SelectedIndex is niet nul, dus WEL leerling. mag form gaan versuten - has_deelnemer_'+eID);
				document.getElementById('has_deelnemer_'+eID).value = '0';
			}	
		}
	}
}

function hideAll(tag, contains, exept)
{
	var x = document.getElementsByTagName(tag);
	for (var i=0;i<x.length;i++) 
	{
		if(x[i].id.indexOf(contains)!=-1)
		{
			hide(x[i].id);
		}
	}	
	show(exept);
}
function showHide(eID)
{
	if(document.getElementById(eID).style.display == 'block')
	{
		hide(eID);
	}
	else
	{
		show(eID);
	}
}
function show(eID)
{
	document.getElementById(eID).style.display = 'block';
}

function hide(eID)
{
	document.getElementById(eID).style.display = 'none';
}

/*
function ativaOptionsDisabled()
{
    var sels = document.getElementsByTagName('select');
    for(var i=0; i < sels.length; i++)
	{
        sels[i].onchange= function()
		{
            if(this.options[this.selectedIndex].disabled)
			{
            	this.selectedIndex = -1;
            }
        }
        if(sels[i].options[sels[i].selectedIndex].disabled)
		{
            sels[i].onchange();
        }    
        for(var j=0; j < sels[i].options.length; j++)
		{
			if(sels[i].options[j].disabled)
			{
                sels[i].options[j].style.color = '#CCC';
            }
        }
    }
}
window.addEventListener("onload", ativaOptionsDisabled, true);
*/