function calculate() {
	var grandtotal = 0;
	for(i=0; i<document.Form1.elements.length; i++)
	{
		if(document.Form1.elements[i].name.search('Price') == 0 )
		{
			if(document.Form1.elements[i].checked)
			{
				grandtotal += parseInt(document.Form1.elements[i].value);
			}
		}
	}
	document.Form1.Total.value = grandtotal;
}