checking if var exsists

[slipperyfish]

how do you check if a variable exsists in javascript?

i no in PHP you can use:

[code]isset($var)[/code]

is there something similar in javascript?

[wildteen88]

Javascript doesnt have a pre built in function like isset. If want to check variable you'll have to do it like this:
[code]if(varName != "")
{
    //then do something here
}
else
{
    //do something else here
}[/code]