/**
 *	@copyright (c) 2009 Mutisys Computers Ltd. All Rights Reserved.
 */

function incfield(field)
{
	inputelement = document.getElementById(field);
	inputvalue = inputelement.value;
	if(inputvalue == "")
	{
		inputvalue = 0;
	}
	inputvalue ++;
	inputelement.value = inputvalue;
}

function decfield(field)
{
	inputelement = document.getElementById(field);
	inputvalue = inputelement.value;
	if(inputvalue == "")
	{
		inputvalue = 0;
	}
	inputvalue --;
	if(inputvalue < 0)
	{
		inputvalue = 0;
	}
	inputelement.value = inputvalue;
}