var ElementInFocus = '';

	function setActiveInput(activeElementId) {
		ElementInFocus = activeElementId;
	}
	
	function increase_fun()	{
	  beg_of_element=ElementInFocus.substr(0,4); 
	  
	  if ((beg_of_element == 'hour') && (document.getElementById(ElementInFocus).value < 23)
		|| (beg_of_element != 'hour') && (document.getElementById(ElementInFocus).value < 59))
	  {
		document.getElementById(ElementInFocus).value++;
		if (document.getElementById(ElementInFocus).value < 10) document.getElementById(ElementInFocus).value = '0' + document.getElementById(ElementInFocus).value;
	  }
	}  

	function decrease_fun()	
	{
	  if (document.getElementById(ElementInFocus).value > 0)
	  {
		document.getElementById(ElementInFocus).value--;
		if (document.getElementById(ElementInFocus).value < 10) document.getElementById(ElementInFocus).value = '0' + document.getElementById(ElementInFocus).value;
	  }
	}