function checkPayment(link,id) {
	paypal_amount = jQuery("#input_amount_"+id);
	error_amount = jQuery("."+id+"_error_block_paypal");
	
	myamount = parseFloat(paypal_amount.val().replace(/\,/g,"."));
	if (checkInput(myamount)) {
		window.location.href= link + "&input=" + myamount;
	}
	else {
		paypal_amount.css("border","1px solid #F00");
		error_amount.css("display","block").css("color","red");
		error_amount.html("Please enter a proper amount");
		paypal_amount.focus();
		paypal_amount.blur(changeInput);
	}
} 

function changeInput(listener) {
	myamount = parseFloat(this.value);
	if (checkInput(myamount)) {
		error_amount.html("Click on the Other again to submit your amount.");
		error_amount.css("color","gray");
	}
}

function checkInput(amount) {
	if(isNaN(amount)) {
		return false;
	}
	if(parseInt(amount) > 0) {
		return true;
	}
	return false;
}