function selectall(el,namePattern)
{var checked=el.checked;var elements=el.form.elements;for(var i=0;i<elements.length;i++){if(elements[i].type.toLowerCase()=='checkbox'&&elements[i].name.indexOf(namePattern)!=-1){elements[i].checked=checked;}}}
var marked_row=new Array;function setColor(row,rowNumber,action,normalClass,mouseOverClass,mouseDownClass){if(action=='click'){if((typeof(marked_row[rowNumber])=='undefined')||!marked_row[rowNumber]){marked_row[rowNumber]=true;}
else{marked_row[rowNumber]=false;}}
if(action=="in"){row.className=mouseOverClass;}
if(action=="out"){if((typeof(marked_row[rowNumber])=='undefined')||!marked_row[rowNumber]){row.className=normalClass;}
else{row.className=mouseDownClass;}}}
function resetInputFieldValueToDefaultIfEmpty(myFormField,defaultValue){if(myFormField.value=='')
myFormField.value=defaultValue;}
function emptyInputFieldValueIfItIsDefaultValue(myFormField,defaultValue){if(myFormField.value==defaultValue)
myFormField.value='';}
function roll(img_name,img_src){document[img_name].src=img_src;}