function calc() {
				var rech = new RegExp(/[^0-9]/g);
				document.contact.number.value = document.contact.number.value.replace(rech,'');
				
				if (!isNaN(document.contact.number.value)){
					am = document.contact.number.value;
					
					if (am < 300){
						am = 0;
						kurs = 240;
					}    
				 	else if ((am >= 300) && (am < 999)){
						kurs = 240;
					}   
				 	else if ((am >= 1000) && (am < 4999)){
						kurs = 260.000000000;
					}
				 	else if ((am >= 5000) && (am < 9999)){
						kurs = 277.932184546;
					}
					else if (am >= 10000){
						kurs = 285.795941697;
					}  
				    sum = addCommas( (Math.round((am/kurs)*100) / 100) ); 
				
					document.contact.amount.value = sum;			
				}
			}
			
			function addCommas(nStr){
				nStr += '';
				x = nStr.split('.');
				x1 = x[0];
				x2 = x.length > 1 ? '.' + x[1] : '';
				var rgx = /(\d+)(\d{3})/;
				while (rgx.test(x1)) {
					x1 = x1.replace(rgx, '$1' + '.' + '$2');
				}
					
				return x1 + x2;
			}
					
			
function calc_2() {
	
					var am = Number(document.contact.amount.value.replace(",", "."));
					
				if ((am >= 1) && (am < 3.54)) {
						kurs = 240;
					} else if((am >= 3.55) && (am < 17.98)) {
						kurs = 260.000000000;
					} else if ((am >= 17.99) && (am < 34.98)) {
						kurs = 277.932184546;
					} else if (am >= 34.99) {
						kurs = 285.795941697;
				 }
				 	
				    sum =  (Math.round((am * kurs)*100) / 100) ; 
				
					document.contact.number.value = sum.toFixed(0)
;			
				
}