function CheckInhalt(StringToCheck){
            txt="Please enter the domain name without extension (.com, .net, .org) or prefix (www.) at the beginning. All 3 endings are checked automatically. Valid characters in a domain name are alphanumeric characters and dash (-). Note, however, that a dash (-) may not appear at the beginning or the end of the domain name.";
            var okString=""; 
        	var ok=1;
        	var checkString=StringToCheck.toLowerCase();
        	var ch;
        
        	if (checkString.length > 3){
        		if (checkString.indexOf(".net") > -1){	
        			checkString=checkString.substring(0,checkString.length -4);}
        			}
        	if (checkString.length > 3){
        		if (checkString.indexOf(".com") == checkString.length - 4){	
        			checkString=checkString.substring(0,checkString.length -4);}
        			}
        	if (checkString.length > 3){
        		if (checkString.indexOf(".biz") > -1){	
        			checkString=checkString.substring(0,checkString.length -4);}
        			}
        	if (checkString.length > 3){
        		if (checkString.indexOf(".co.uk") == checkString.length - 6){	
        			checkString=checkString.substring(0,checkString.length -6);}
        			}
        				if (checkString.length > 3){
        	if (checkString.indexOf(".org.uk") == checkString.length - 6){	
        			checkString=checkString.substring(0,checkString.length -6);}
        			}
        	if (checkString.length > 3){
        		if (checkString.indexOf(".ltd.uk") == checkString.length - 6){	
        			checkString=checkString.substring(0,checkString.length -6);}
        			}
        	if (checkString.length > 3){
        		if (checkString.indexOf(".net.uk") == checkString.length - 6){	
        			checkString=checkString.substring(0,checkString.length -6);}
        			}
        	if (checkString.length > 3){
        		if (checkString.indexOf(".org") == checkString.length - 4){	
        			checkString=checkString.substring(0,checkString.length -4);}
        			}
        
        	if (checkString.length > 3){
        		if (checkString.indexOf("www.") > -1){
        			checkString=checkString.substring(4,checkString.length);}
        			}
        
            for (i = 0; i < checkString.length; i++) { 
        		ch = checkString.substring(i, i+1);
                if ((ch >= "a" && ch <= "z") || (ch >= "A" && ch <= "Z") ||
                    (ch >= "0" && ch <= "9") || (ch == "-")) {
        	  		 okString=okString+ch;
        			 i=i;}
        		else {
        		ok=0;
        		}
            }
        	if ((ok==0) || (checkString.charAt(0)=="-") || (checkString.charAt(checkString.length-1)=="-")) {
        		alert(txt);
        		return okString;
                } else {
        		return checkString;}
                }