Someone

function planIn(stepname){
	fm = new JsFrame();
	overlay = new GreyBox();
	overlay.addRow("Stap naam",fm.TN(stepname));
	overlay.addRow("Begin datum",fm.INPUT({'type':'text','name':'begindate'}));
	overlay.addRow("Eind datum",fm.INPUT({'type':'text','name':'eindatum'}));
	this.check = fm.INPUT({'type':'checkbox','name':'check','checked':'true'});
	this.checkname ="kevin";
	var self = this;
	this.check.onclick = function(e){
		self.handleClick(e);
	}
	//fm.AttachEvent(this.check,"click",planIn.prototype.handleClick);
	overlay.addRow("Volledige dagen",this.check);
	overlay.addRow("Begin uur",fm.INPUT({'type':'text','name':'beginuur'}));
	overlay.addRow("Eind uur",fm.INPUT({'type':'text','name':'beginuur'}));
	//check = 
	overlay.setForm("Add","index.php?pt=projects&m=steps&p=list");
	overlay.show('Plan in');
	
}
planIn.prototype.handleClick = function(e){
	alert(this.checkname);
}