function calculatPrice(){
	if(!document.getElementById("customers").value)
	{
		alert('Please select customer');
		document.getElementById("customers").focus();
		return false;
	}

	var text='';
	n = document.getElementById('en_attendgroup').value;
	if(document.getElementById("customers").value=='customer')
	{
		if(document.getElementById("regType").value=='earlybird')
			var regAmount	= 1200;
		else
			var regAmount	= 1500;

		if(n == 4)
		{
		  discount 	= 0 ;
		  regAmount	= regAmount;
		}
		else if(n == 15)
		{
		  discount 	= 10 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
		else if(n == 25)
		{
		  discount 	= 15 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
		else if(n == 40)
		{
		  discount 	= 20 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
			
	}
	else if(document.getElementById("customers").value == 'Last Years Attendee')
		regAmount	= 1000;
	else if(document.getElementById("customers").value == 'User Group Members')
		regAmount	= 1500 - (1500 * 30 / 100);
	else if(document.getElementById("customers").value == 'Business Partner')
	{
		if(document.getElementById("regType").value=='earlybird')
			var regAmount	= 1200;
		else
			var regAmount	= 1500;

		if(n == 4)
		{
		  discount 	= 0 ;
		  regAmount	= regAmount;
		}
		else if(n == 15)
		{
		  discount 	= 10 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
		else if(n == 25)
		{
		  discount 	= 15 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
		else if(n == 40)
		{
		  discount 	= 20 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
			
	}
	else if(document.getElementById("customers").value == 'Independent Software Vendor')
	{
		if(document.getElementById("regType").value=='earlybird')
			var regAmount	= 1200;
		else
			var regAmount	= 1500;

		if(n == 4)
		{
		  discount 	= 0 ;
		  regAmount	= regAmount;
		}
		else if(n == 15)
		{
		  discount 	= 10 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
		else if(n == 25)
		{
		  discount 	= 15 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
		else if(n == 40)
		{
		  discount 	= 20 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
			
	}
	else if(document.getElementById("customers").value == 'Academia')
	{
		if(document.getElementById("regType").value=='earlybird')
			var regAmount	= 1200;
		else
			var regAmount	= 1500;

		if(n == 4)
		{
		  discount 	= 0 ;
		  regAmount	= regAmount;
		}
		else if(n == 15)
		{
		  discount 	= 10 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
		else if(n == 25)
		{
		  discount 	= 15 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
		else if(n == 40)
		{
		  discount 	= 20 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
			
	}
	else if(document.getElementById("customers").value == 'IBMer')
	{
		if(document.getElementById("regType").value=='earlybird')
			var regAmount	= 1200;
		else
			var regAmount	= 1500;

		if(n == 4)
		{
		  discount 	= 0 ;
		  regAmount	= regAmount;
		}
		else if(n == 15)
		{
		  discount 	= 10 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
		else if(n == 25)
		{
		  discount 	= 15 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
		else if(n == 40)
		{
		  discount 	= 20 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
			
	}
	else if(document.getElementById("customers").value == 'Others')
	{
		if(document.getElementById("regType").value=='earlybird')
			var regAmount	= 1200;
		else
			var regAmount	= 1500;
			
		if(n == 4)
		{
		  discount 	= 0 ;
		  regAmount	= regAmount;
		}
		else if(n == 15)
		{
		  discount 	= 10 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
		else if(n == 25)
		{
		  discount 	= 15 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
		else if(n == 40)
		{
		  discount 	= 20 ;
		  regAmount	= regAmount - (regAmount * discount / 100);
		}
			
	}



	var cNo = 0;
	for(i=1; i <= n; i++)
	{
		aa = "attendee_certificat" + i + "_1";
		if(document.getElementById(aa).checked == true)
			cNo = cNo + 1;
	}
	
	var cAmount = 0 ;
	for(i=1; i<=cNo; i++)
	{
		cAmount = cAmount + 500;
	}
	//alert(cNo + " = " + cAmount);


	var id			= "attendee_name";
	var price		= document.getElementById('amount_pay').value;
	var totPro		= 0;
	var totPrice	= 0;
	for(i=1; i<=n; i++){
 		id="attendee_name"+i;
		if(ltrim(document.getElementById(id).value)){
 			totPro = totPro + 1;
 		}
	}
	
	totParticipate 	= regAmount * totPro;
	totPrice 		= totParticipate + cAmount;
	
	price			= (price*totPro).toFixed(2);
	document.getElementById("price").innerHTML = totPrice;
	document.getElementById("participateCost").innerHTML = totParticipate;
	document.getElementById("certificateCost").innerHTML = cAmount;
	
	document.getElementById("amount").value=totPrice;
	document.getElementById("amount_tot").value=totPrice;
	
//alert(price)
}
function ltrim(str) { 
	for(var k = 0; k < str.length && isWhitespace(str.charAt(k)); k++);
		return str.substring(k, str.length);
}
function rtrim(str) {
	for(var j=str.length-1; j>=0 && isWhitespace(str.charAt(j)) ; j--) ;
		return str.substring(0,j+1);
}
function trim(str) {
		return ltrim(rtrim(str));
}
function isWhitespace(charToCheck) {
		var whitespaceChars = " \t\n\r\f";
		return (whitespaceChars.indexOf(charToCheck) != -1);
}