function checkemail(s){
		    	var a = false;
		    	var res = false;
			    if(typeof(RegExp) == 'function')
		    	{
		    		var b = new RegExp('abc');
		    		if(b.test('abc') == true){a = true;}
		   		 }
		
		   		 if(a == true)
		   		 {
		        	reg = new RegExp('^([a-zA-Z0-9\-\.\_]+)'+'(\@)([a-zA-Z0-9\-\.]+)'+'(\.)([a-zA-Z]{2,4})$');
		    		 res = (reg.test(s));
		    	}
		   		 else
		   		 {
		      	  res = (s.search('@') >= 1 && s.lastIndexOf('.') > s.search('@') && s.lastIndexOf('.') >= s.length-5)
		    	}
		    return(res);
			}
		
			function checkForm()
		        {
				var send = 1;		
		  
				   
		           
				   if (document.contact.first_name.value.length == 0)
		           {
				   document.contact.first_name.style.backgroundColor='#C77E20';
		           if(send==1){document.contact.first_name.focus();}
		           send = 0;}else{
		           document.contact.first_name.style.backgroundColor='#FFFFFF';
		           }
		           
				   if (document.contact.last_name.value.length == 0)
		           {
				   document.contact.last_name.style.backgroundColor='#C77E20';
		           if(send==1){document.contact.last_name.focus();}
		           send = 0;}else{
		           document.contact.last_name.style.backgroundColor='#FFFFFF';
		           }
				   
				   if (document.contact.email.value.length == 0)
			           {
					   document.contact.email.style.backgroundColor='#C77E20';
			           if(send==1){document.contact.email.focus();}
			           send = 0;}else{
			           document.contact.email.style.backgroundColor='#FFFFFF';
			           }
				   
		           
		           if(send == 1) {
		        return true;
		        }else{
		        alert('Die farbig unterlegten Felder m' + String.fromCharCode(252) + 'ssen ausgef' + String.fromCharCode(252) + 'llt werden.');
		        return false;
		        }
		     }
<!-- 
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 -->