function szamol() {
						
						  var minSplit= document.form1.minimumDate.value;
							var vagott = new Array();
							vagott= minSplit.split("/");
							
						  var maxSplit= document.form1.maximumDate.value;
							var vagott2 = new Array();
							vagott2=maxSplit.split("/");

							var probaDateMin = new Date();
							var probaDateMax = new Date();
							vagott[0] = vagott[0]*1;
							vagott[0]--;
							vagott2[0] = vagott2[0]*1;
							vagott2[0]--;
							probaDateMin.setFullYear(vagott[2],vagott[0],vagott[1]) ;
							probaDateMax.setFullYear(vagott2[2],vagott2[0],vagott2[1]) ;
								
              var DivDates =  Math.floor((probaDateMax - probaDateMin)/86400000);
						
						  if (DivDates >0) {document.form1.dayz.value= DivDates;}
							else if (DivDates <= 0) {document.form1.dayz.value= "invalid date";}
							
							}